diff --git a/src/dsp/node_code.rs b/src/dsp/node_code.rs
index 2835211..4a23385 100644
--- a/src/dsp/node_code.rs
+++ b/src/dsp/node_code.rs
@@ -5,7 +5,7 @@
 use crate::dsp::{DspNode, LedPhaseVals, NodeContext, NodeId, ProcBuf, SAtom};
 use crate::nodes::{NodeAudioContext, NodeExecContext};
 #[cfg(feature = "synfx-dsp-jit")]
-use crate::wblockdsp::CodeEngineBackend;
+use synfx_dsp_jit::engine::CodeEngineBackend;
 
 //use crate::dsp::MAX_BLOCK_SIZE;
 
diff --git a/src/lib.rs b/src/lib.rs
index 6cae805..f944009 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -321,11 +321,7 @@ pub mod monitor;
 pub mod nodes;
 pub mod sample_lib;
 pub mod scope_handle;
-#[cfg(feature="synfx-dsp-jit")]
 pub mod wblockdsp;
-pub mod blocklang;
-pub mod blocklang_def;
-mod block_compiler;
 mod util;
 
 pub use cell_dir::CellDir;
diff --git a/src/matrix.rs b/src/matrix.rs
index 9817541..ee2fb50 100644
--- a/src/matrix.rs
+++ b/src/matrix.rs
@@ -10,8 +10,7 @@ pub use crate::nodes::MinMaxMonitorSamples;
 use crate::nodes::{NodeConfigurator, NodeGraphOrdering, NodeProg, MAX_ALLOCATED_NODES};
 pub use crate::CellDir;
 use crate::ScopeHandle;
-use crate::blocklang::{BlockFun, BlockFunSnapshot};
-use crate::block_compiler::BlkJITCompileError;
+use crate::wblockdsp::{BlockFun, BlockFunSnapshot, BlkJITCompileError};
 
 use std::collections::{HashMap, HashSet};
 
@@ -600,13 +599,13 @@ impl Matrix {
 
     /// Checks the block function for the id `id`. If the block function did change,
     /// updates are then sent to the audio thread.
-    /// See also [get_block_function].
+    /// See also [Matrix::get_block_function].
     pub fn check_block_function(&mut self, id: usize) -> Result<(), BlkJITCompileError> {
         self.config.check_block_function(id)
     }
 
     /// Retrieve a handle to the block function `id`. In case you modify the block function,
-    /// make sure to call [check_block_function].
+    /// make sure to call [Matrix::check_block_function].
     pub fn get_block_function(&self, id: usize) -> Option<Arc<Mutex<BlockFun>>> {
         self.config.get_block_function(id)
     }
diff --git a/src/matrix_repr.rs b/src/matrix_repr.rs
index 6611d0a..3d34aa3 100644
--- a/src/matrix_repr.rs
+++ b/src/matrix_repr.rs
@@ -4,7 +4,7 @@
 
 use crate::dsp::{NodeId, ParamId, SAtom};
 use serde_json::{json, Value};
-use crate::blocklang::BlockFunSnapshot;
+use crate::wblockdsp::BlockFunSnapshot;
 
 #[derive(Debug, Clone, Copy)]
 pub struct CellRepr {
diff --git a/src/nodes/node_conf.rs b/src/nodes/node_conf.rs
index 2403b4c..4fb8f50 100644
--- a/src/nodes/node_conf.rs
+++ b/src/nodes/node_conf.rs
@@ -6,15 +6,13 @@ use super::{
     FeedbackFilter, GraphMessage, NodeOp, NodeProg, MAX_ALLOCATED_NODES, MAX_AVAIL_CODE_ENGINES,
     MAX_AVAIL_TRACKERS, MAX_INPUTS, MAX_SCOPES, UNUSED_MONITOR_IDX,
 };
-use crate::block_compiler::{BlkJITCompileError, Block2JITCompiler};
-use crate::blocklang::*;
-use crate::blocklang_def;
+use crate::wblockdsp::*;
 use crate::dsp::tracker::{PatternData, Tracker};
 use crate::dsp::{node_factory, Node, NodeId, NodeInfo, ParamId, SAtom};
 use crate::monitor::{new_monitor_processor, MinMaxMonitorSamples, Monitor, MON_SIG_CNT};
 use crate::nodes::drop_thread::DropThread;
 #[cfg(feature = "synfx-dsp-jit")]
-use crate::wblockdsp::CodeEngine;
+use synfx_dsp_jit::engine::CodeEngine;
 use crate::SampleLibrary;
 use crate::ScopeHandle;
 
@@ -190,7 +188,7 @@ pub struct NodeConfigurator {
     pub(crate) code_engines: Vec<CodeEngine>,
     /// Holds the block functions that are JIT compiled to DSP code
     /// for the `Code` nodes. The code is then sent via the [CodeEngine]
-    /// in [check_block_function].
+    /// in [NodeConfigurator::check_block_function].
     #[cfg(feature = "synfx-dsp-jit")]
     pub(crate) block_functions: Vec<(u64, Arc<Mutex<BlockFun>>)>,
     /// The shared parts of the [NodeConfigurator]
@@ -284,9 +282,9 @@ impl NodeConfigurator {
 
         #[cfg(feature = "synfx-dsp-jit")]
         let (code_engines, block_functions) = {
-            let code_engines = vec![CodeEngine::new(); MAX_AVAIL_CODE_ENGINES];
+            let code_engines = vec![CodeEngine::new_stdlib(); MAX_AVAIL_CODE_ENGINES];
 
-            let lang = blocklang_def::setup_hxdsp_block_language(code_engines[0].get_lib());
+            let lang = setup_hxdsp_block_language(code_engines[0].get_lib());
             let mut block_functions = vec![];
             block_functions.resize_with(MAX_AVAIL_CODE_ENGINES, || {
                 (0, Arc::new(Mutex::new(BlockFun::new(lang.clone()))))
@@ -703,7 +701,7 @@ impl NodeConfigurator {
 
     /// Checks the block function for the id `id`. If the block function did change,
     /// updates are then sent to the audio thread.
-    /// See also [get_block_function].
+    /// See also [NodeConfigurator::get_block_function].
     pub fn check_block_function(&mut self, id: usize) -> Result<(), BlkJITCompileError> {
         #[cfg(feature = "synfx-dsp-jit")]
         if let Some((generation, block_fun)) = self.block_functions.get_mut(id) {
@@ -727,7 +725,7 @@ impl NodeConfigurator {
     }
 
     /// Retrieve a handle to the block function `id`. In case you modify the block function,
-    /// make sure to call [check_block_function].
+    /// make sure to call [NodeConfigurator::check_block_function].
     pub fn get_block_function(&self, id: usize) -> Option<Arc<Mutex<BlockFun>>> {
         #[cfg(feature = "synfx-dsp-jit")]
         {
diff --git a/src/wblockdsp.rs b/src/wblockdsp.rs
deleted file mode 100644
index e056a02..0000000
--- a/src/wblockdsp.rs
+++ /dev/null
@@ -1,152 +0,0 @@
-// Copyright (c) 2022 Weird Constructor <weirdconstructor@gmail.com>
-// This file is a part of HexoDSP. Released under GPL-3.0-or-later.
-// See README.md and COPYING for details.
-
-use synfx_dsp_jit::*;
-
-use ringbuf::{Consumer, Producer, RingBuffer};
-use std::cell::RefCell;
-use std::rc::Rc;
-
-const MAX_RINGBUF_SIZE: usize = 128;
-
-enum CodeUpdateMsg {
-    UpdateFun(Box<DSPFunction>),
-}
-
-enum CodeReturnMsg {
-    DestroyFun(Box<DSPFunction>),
-}
-
-pub struct CodeEngine {
-    dsp_ctx: Rc<RefCell<DSPNodeContext>>,
-    lib: Rc<RefCell<DSPNodeTypeLibrary>>,
-    update_prod: Producer<CodeUpdateMsg>,
-    return_cons: Consumer<CodeReturnMsg>,
-}
-
-impl Clone for CodeEngine {
-    fn clone(&self) -> Self {
-        CodeEngine::new()
-    }
-}
-
-impl CodeEngine {
-    pub fn new() -> Self {
-        let rb = RingBuffer::new(MAX_RINGBUF_SIZE);
-        let (update_prod, _update_cons) = rb.split();
-        let rb = RingBuffer::new(MAX_RINGBUF_SIZE);
-        let (_return_prod, return_cons) = rb.split();
-
-        let lib = get_standard_library();
-
-        Self { lib, dsp_ctx: DSPNodeContext::new_ref(), update_prod, return_cons }
-    }
-
-    pub fn get_lib(&self) -> Rc<RefCell<DSPNodeTypeLibrary>> {
-        self.lib.clone()
-    }
-
-    pub fn upload(&mut self, ast: Box<ASTNode>) -> Result<(), JITCompileError> {
-        let jit = JIT::new(self.lib.clone(), self.dsp_ctx.clone());
-        let fun = jit.compile(ASTFun::new(ast))?;
-        let _ = self.update_prod.push(CodeUpdateMsg::UpdateFun(fun));
-
-        Ok(())
-    }
-
-    pub fn cleanup(&self, fun: Box<DSPFunction>) {
-        self.dsp_ctx.borrow_mut().cleanup_dsp_fun_after_user(fun);
-    }
-
-    pub fn query_returns(&mut self) {
-        while let Some(msg) = self.return_cons.pop() {
-            match msg {
-                CodeReturnMsg::DestroyFun(fun) => {
-                    self.cleanup(fun);
-                }
-            }
-        }
-    }
-
-    pub fn get_backend(&mut self) -> CodeEngineBackend {
-        let rb = RingBuffer::new(MAX_RINGBUF_SIZE);
-        let (update_prod, update_cons) = rb.split();
-        let rb = RingBuffer::new(MAX_RINGBUF_SIZE);
-        let (return_prod, return_cons) = rb.split();
-
-        self.update_prod = update_prod;
-        self.return_cons = return_cons;
-
-        let function = get_nop_function(self.lib.clone(), self.dsp_ctx.clone());
-        CodeEngineBackend::new(function, update_cons, return_prod)
-    }
-}
-
-impl Drop for CodeEngine {
-    fn drop(&mut self) {
-        self.dsp_ctx.borrow_mut().free();
-    }
-}
-
-pub struct CodeEngineBackend {
-    sample_rate: f32,
-    function: Box<DSPFunction>,
-    update_cons: Consumer<CodeUpdateMsg>,
-    return_prod: Producer<CodeReturnMsg>,
-}
-
-impl CodeEngineBackend {
-    fn new(
-        function: Box<DSPFunction>,
-        update_cons: Consumer<CodeUpdateMsg>,
-        return_prod: Producer<CodeReturnMsg>,
-    ) -> Self {
-        Self { sample_rate: 0.0, function, update_cons, return_prod }
-    }
-
-    #[inline]
-    pub fn process(
-        &mut self,
-        in1: f32,
-        in2: f32,
-        a: f32,
-        b: f32,
-        d: f32,
-        g: f32,
-    ) -> (f32, f32, f32) {
-        let mut s1 = 0.0_f64;
-        let mut s2 = 0.0_f64;
-        let res = self
-            .function
-            .exec(in1 as f64, in2 as f64, a as f64, b as f64, d as f64, g as f64, &mut s1, &mut s2);
-        (s1 as f32, s2 as f32, res as f32)
-    }
-
-    pub fn swap_fun(&mut self, srate: f32, mut fun: Box<DSPFunction>) -> Box<DSPFunction> {
-        std::mem::swap(&mut self.function, &mut fun);
-        self.function.init(srate as f64, Some(&fun));
-        fun
-    }
-
-    pub fn set_sample_rate(&mut self, srate: f32) {
-        self.sample_rate = srate;
-        self.function.set_sample_rate(srate as f64);
-    }
-
-    pub fn clear(&mut self) {
-        self.function.reset();
-    }
-
-    pub fn process_updates(&mut self) {
-        while let Some(msg) = self.update_cons.pop() {
-            match msg {
-                CodeUpdateMsg::UpdateFun(mut fun) => {
-                    std::mem::swap(&mut self.function, &mut fun);
-                    self.function.init(self.sample_rate as f64, Some(&fun));
-                    let _ = self.return_prod.push(CodeReturnMsg::DestroyFun(fun));
-                }
-            }
-        }
-    }
-}
diff --git a/src/block_compiler.rs b/src/wblockdsp/compiler.rs
similarity index 83%
rename from src/block_compiler.rs
rename to src/wblockdsp/compiler.rs
index 44bbe83..608dc46 100644
--- a/src/block_compiler.rs
+++ b/src/wblockdsp/compiler.rs
@@ -6,7 +6,7 @@ use std::cell::RefCell;
 use std::collections::HashMap;
 use std::rc::Rc;
 
-use crate::blocklang::*;
+use super::language::*;
 #[cfg(feature = "synfx-dsp-jit")]
 use synfx_dsp_jit::{ASTNode, JITCompileError};
 
@@ -18,6 +18,8 @@ struct JASTNode {
     nodes: Vec<(String, String, ASTNodeRef)>,
 }
 
+/// The WBlockDSP Abstract Syntax Tree. It is generated by [BlockFun::generate_tree]
+/// in [Block2JITCompiler::compile].
 #[derive(Debug, Clone)]
 pub struct ASTNodeRef(Rc<RefCell<JASTNode>>);
 
@@ -37,18 +39,26 @@ impl BlockASTNode for ASTNodeRef {
 }
 
 impl ASTNodeRef {
+    /// Returns the first child AST node.
     pub fn first_child_ref(&self) -> Option<ASTNodeRef> {
         self.0.borrow().nodes.get(0).map(|n| n.2.clone())
     }
 
+    /// Returns the first child, including input/output info.
     pub fn first_child(&self) -> Option<(String, String, ASTNodeRef)> {
         self.0.borrow().nodes.get(0).cloned()
     }
 
+    /// Returns the nth child, including input/output info.
     pub fn nth_child(&self, i: usize) -> Option<(String, String, ASTNodeRef)> {
         self.0.borrow().nodes.get(i).cloned()
     }
 
+    /// Generates a recursive tree dump output.
+    ///
+    ///```ignore
+    /// println!("{}", node.walk_dump("", "", 0));
+    ///```
     pub fn walk_dump(&self, input: &str, output: &str, indent: usize) -> String {
         let indent_str = "   ".repeat(indent + 1);
 
@@ -528,17 +538,21 @@ mod test {
         };
     }
 
+    fn put_n(bf: &mut BlockFun, a: usize, x: i64, y: i64, s: &str) {
+        bf.instanciate_at(a, x, y, s, None).expect("no put error");
+    }
+
+    fn put_v(bf: &mut BlockFun, a: usize, x: i64, y: i64, s: &str, v: &str) {
+        bf.instanciate_at(a, x, y, s, Some(v.to_string())).expect("no put error");
+    }
+
     use synfx_dsp_jit::{get_standard_library, ASTFun, DSPFunction, DSPNodeContext, JIT};
 
     fn new_jit_fun<F: FnMut(&mut BlockFun)>(
         mut f: F,
     ) -> (Rc<RefCell<DSPNodeContext>>, Box<DSPFunction>) {
-        use crate::block_compiler::{BlkJITCompileError, Block2JITCompiler};
-        use crate::blocklang::BlockFun;
-        use crate::blocklang_def;
-
         let lib = get_standard_library();
-        let lang = blocklang_def::setup_hxdsp_block_language(lib.clone());
+        let lang = crate::wblockdsp::setup_hxdsp_block_language(lib.clone());
         let mut bf = BlockFun::new(lang.clone());
 
         f(&mut bf);
@@ -557,11 +571,11 @@ mod test {
     #[test]
     fn check_blocklang_sig1() {
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.3".to_string())).unwrap();
-            bf.instanciate_at(0, 1, 1, "set", Some("&sig1".to_string())).unwrap();
-            bf.instanciate_at(0, 0, 2, "value", Some("-0.3".to_string())).unwrap();
-            bf.instanciate_at(0, 1, 2, "set", Some("&sig2".to_string())).unwrap();
-            bf.instanciate_at(0, 0, 3, "value", Some("-1.3".to_string())).unwrap();
+            put_v(bf, 0, 0, 1, "value", "0.3");
+            put_v(bf, 0, 1, 1, "set", "&sig1");
+            put_v(bf, 0, 0, 2, "value", "-0.3");
+            put_v(bf, 0, 1, 2, "set", "&sig2");
+            put_v(bf, 0, 0, 3, "value", "-1.3");
         });
 
         let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
@@ -576,31 +590,31 @@ mod test {
     #[test]
     fn check_blocklang_accum_shift() {
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 1, 1, "accum", None);
+            put_n(bf, 0, 1, 1, "accum");
             bf.shift_port(0, 1, 1, 1, false);
-            bf.instanciate_at(0, 0, 2, "value", Some("0.01".to_string()));
-            bf.instanciate_at(0, 0, 1, "get", Some("*reset".to_string()));
+            put_v(bf, 0, 0, 2, "value", "0.01");
+            put_v(bf, 0, 0, 1, "get", "*reset");
         });
 
         fun.exec_2in_2out(0.0, 0.0);
         fun.exec_2in_2out(0.0, 0.0);
         fun.exec_2in_2out(0.0, 0.0);
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
+        let (_s1, _s2, ret) = fun.exec_2in_2out(0.0, 0.0);
         assert_float_eq!(ret, 0.04);
 
         let reset_idx = ctx.borrow().get_persistent_variable_index_by_name("*reset").unwrap();
         fun.access_persistent_var(reset_idx).map(|reset| *reset = 1.0);
 
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
+        let (_s1, _s2, ret) = fun.exec_2in_2out(0.0, 0.0);
         assert_float_eq!(ret, 0.0);
 
         fun.access_persistent_var(reset_idx).map(|reset| *reset = 0.0);
 
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
+        fun.exec_2in_2out(0.0, 0.0);
+        fun.exec_2in_2out(0.0, 0.0);
+        fun.exec_2in_2out(0.0, 0.0);
+        fun.exec_2in_2out(0.0, 0.0);
+        let (_s1, _s2, ret) = fun.exec_2in_2out(0.0, 0.0);
         assert_float_eq!(ret, 0.05);
 
         ctx.borrow_mut().free();
@@ -610,64 +624,64 @@ mod test {
     fn check_blocklang_arithmetics() {
         // Check + and *
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.50".to_string()));
-            bf.instanciate_at(0, 0, 2, "value", Some("0.01".to_string()));
-            bf.instanciate_at(0, 1, 1, "+", None);
+            put_v(bf, 0, 0, 1, "value", "0.50");
+            put_v(bf, 0, 0, 2, "value", "0.01");
+            put_n(bf, 0, 1, 1, "+");
             bf.shift_port(0, 1, 1, 1, true);
-            bf.instanciate_at(0, 1, 3, "value", Some("2.0".to_string()));
-            bf.instanciate_at(0, 2, 2, "*", None);
+            put_v(bf, 0, 1, 3, "value", "2.0");
+            put_n(bf, 0, 2, 2, "*");
         });
 
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
+        let (_s1, _s2, ret) = fun.exec_2in_2out(0.0, 0.0);
         assert_float_eq!(ret, 1.02);
         ctx.borrow_mut().free();
 
         // Check - and /
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.50".to_string()));
-            bf.instanciate_at(0, 0, 2, "value", Some("0.01".to_string()));
-            bf.instanciate_at(0, 1, 1, "-", None);
+            put_v(bf, 0, 0, 1, "value", "0.50");
+            put_v(bf, 0, 0, 2, "value", "0.01");
+            put_n(bf, 0, 1, 1, "-");
             bf.shift_port(0, 1, 1, 1, true);
-            bf.instanciate_at(0, 1, 3, "value", Some("2.0".to_string()));
-            bf.instanciate_at(0, 2, 2, "/", None);
+            put_v(bf, 0, 1, 3, "value", "2.0");
+            put_n(bf, 0, 2, 2, "/");
         });
 
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
+        let (_s1, _s2, ret) = fun.exec_2in_2out(0.0, 0.0);
         assert_float_eq!(ret, (0.5 - 0.01) / 2.0);
         ctx.borrow_mut().free();
 
         // Check swapping inputs of "-"
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.50".to_string()));
-            bf.instanciate_at(0, 0, 2, "value", Some("0.01".to_string()));
-            bf.instanciate_at(0, 1, 1, "-", None);
+            put_v(bf, 0, 0, 1, "value", "0.50");
+            put_v(bf, 0, 0, 2, "value", "0.01");
+            put_n(bf, 0, 1, 1, "-");
             bf.shift_port(0, 1, 1, 1, false);
         });
 
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
+        let (_s1, _s2, ret) = fun.exec_2in_2out(0.0, 0.0);
         assert_float_eq!(ret, 0.01 - 0.5);
         ctx.borrow_mut().free();
 
         // Check swapping inputs of "/"
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.50".to_string()));
-            bf.instanciate_at(0, 0, 2, "value", Some("0.01".to_string()));
-            bf.instanciate_at(0, 1, 1, "/", None);
+            put_v(bf, 0, 0, 1, "value", "0.50");
+            put_v(bf, 0, 0, 2, "value", "0.01");
+            put_n(bf, 0, 1, 1, "/");
             bf.shift_port(0, 1, 1, 1, false);
         });
 
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
+        let (_s1, _s2, ret) = fun.exec_2in_2out(0.0, 0.0);
         assert_float_eq!(ret, 0.01 / 0.5);
         ctx.borrow_mut().free();
 
         // Check division of 0.0
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.50".to_string()));
-            bf.instanciate_at(0, 0, 2, "value", Some("0.0".to_string()));
-            bf.instanciate_at(0, 1, 1, "/", None);
+            put_v(bf, 0, 0, 1, "value", "0.50");
+            put_v(bf, 0, 0, 2, "value", "0.0");
+            put_n(bf, 0, 1, 1, "/");
         });
 
-        let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
+        let (_s1, _s2, ret) = fun.exec_2in_2out(0.0, 0.0);
         assert_float_eq!(ret, 0.5 / 0.0);
         ctx.borrow_mut().free();
     }
@@ -676,10 +690,10 @@ mod test {
     fn check_blocklang_divrem() {
         // &sig1 on second output:
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.3".to_string())).unwrap();
-            bf.instanciate_at(0, 0, 2, "value", Some("-0.4".to_string())).unwrap();
-            bf.instanciate_at(0, 1, 1, "/%", None);
-            bf.instanciate_at(0, 2, 2, "set", Some("&sig1".to_string())).unwrap();
+            put_v(bf, 0, 0, 1, "value", "0.3");
+            put_v(bf, 0, 0, 2, "value", "-0.4");
+            put_n(bf, 0, 1, 1, "/%");
+            put_v(bf, 0, 2, 2, "set", "&sig1");
         });
 
         let (s1, _, ret) = fun.exec_2in_2out(0.0, 0.0);
@@ -690,10 +704,10 @@ mod test {
 
         // &sig1 on first output:
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.3".to_string())).unwrap();
-            bf.instanciate_at(0, 0, 2, "value", Some("-0.4".to_string())).unwrap();
-            bf.instanciate_at(0, 1, 1, "/%", None);
-            bf.instanciate_at(0, 2, 1, "set", Some("&sig1".to_string())).unwrap();
+            put_v(bf, 0, 0, 1, "value", "0.3");
+            put_v(bf, 0, 0, 2, "value", "-0.4");
+            put_n(bf, 0, 1, 1, "/%");
+            put_v(bf, 0, 2, 1, "set", "&sig1");
         });
 
         let (s1, _, ret) = fun.exec_2in_2out(0.0, 0.0);
@@ -704,10 +718,10 @@ mod test {
 
         // &sig1 on second output, but swapped outputs:
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.3".to_string())).unwrap();
-            bf.instanciate_at(0, 0, 2, "value", Some("-0.4".to_string())).unwrap();
-            bf.instanciate_at(0, 1, 1, "/%", None);
-            bf.instanciate_at(0, 2, 2, "set", Some("&sig1".to_string())).unwrap();
+            put_v(bf, 0, 0, 1, "value", "0.3");
+            put_v(bf, 0, 0, 2, "value", "-0.4");
+            put_n(bf, 0, 1, 1, "/%");
+            put_v(bf, 0, 2, 2, "set", "&sig1");
             bf.shift_port(0, 1, 1, 0, true);
         });
 
@@ -719,10 +733,10 @@ mod test {
 
         // &sig1 on first output, but swapped outputs:
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.3".to_string())).unwrap();
-            bf.instanciate_at(0, 0, 2, "value", Some("-0.4".to_string())).unwrap();
-            bf.instanciate_at(0, 1, 1, "/%", None);
-            bf.instanciate_at(0, 2, 1, "set", Some("&sig1".to_string())).unwrap();
+            put_v(bf, 0, 0, 1, "value", "0.3");
+            put_v(bf, 0, 0, 2, "value", "-0.4");
+            put_n(bf, 0, 1, 1, "/%");
+            put_v(bf, 0, 2, 1, "set", "&sig1");
             bf.shift_port(0, 1, 1, 0, true);
         });
 
@@ -734,10 +748,10 @@ mod test {
 
         // &sig1 on first output, but swapped inputs:
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.3".to_string())).unwrap();
-            bf.instanciate_at(0, 0, 2, "value", Some("-0.4".to_string())).unwrap();
-            bf.instanciate_at(0, 1, 1, "/%", None);
-            bf.instanciate_at(0, 2, 1, "set", Some("&sig1".to_string())).unwrap();
+            put_v(bf, 0, 0, 1, "value", "0.3");
+            put_v(bf, 0, 0, 2, "value", "-0.4");
+            put_n(bf, 0, 1, 1, "/%");
+            put_v(bf, 0, 2, 1, "set", "&sig1");
             bf.shift_port(0, 1, 1, 0, false);
         });
 
@@ -749,10 +763,10 @@ mod test {
 
         // &sig1 on first output, but swapped inputs and outputs:
         let (ctx, mut fun) = new_jit_fun(|bf| {
-            bf.instanciate_at(0, 0, 1, "value", Some("0.3".to_string())).unwrap();
-            bf.instanciate_at(0, 0, 2, "value", Some("-0.4".to_string())).unwrap();
-            bf.instanciate_at(0, 1, 1, "/%", None);
-            bf.instanciate_at(0, 2, 1, "set", Some("&sig1".to_string())).unwrap();
+            put_v(bf, 0, 0, 1, "value", "0.3");
+            put_v(bf, 0, 0, 2, "value", "-0.4");
+            put_n(bf, 0, 1, 1, "/%");
+            put_v(bf, 0, 2, 1, "set", "&sig1");
             bf.shift_port(0, 1, 1, 0, false);
             bf.shift_port(0, 1, 1, 0, true);
         });
diff --git a/src/blocklang_def.rs b/src/wblockdsp/definition.rs
similarity index 89%
rename from src/blocklang_def.rs
rename to src/wblockdsp/definition.rs
index d7949ce..f73a00a 100644
--- a/src/blocklang_def.rs
+++ b/src/wblockdsp/definition.rs
@@ -2,32 +2,22 @@
 // This file is a part of HexoDSP. Released under GPL-3.0-or-later.
 // See README.md and COPYING for details.
 
-use crate::blocklang::{BlockLanguage, BlockType, BlockUserInput};
+use crate::wblockdsp::{BlockLanguage, BlockType, BlockUserInput};
 use std::cell::RefCell;
 use std::rc::Rc;
 #[cfg(feature = "synfx-dsp-jit")]
 use synfx_dsp_jit::DSPNodeTypeLibrary;
 
+/** WBlockDSP language definition and standard library of nodes.
+
+Most of the nodes are taken from the [synfx_dsp_jit] crate standard library.
+*/
 #[cfg(feature = "synfx-dsp-jit")]
 pub fn setup_hxdsp_block_language(
     dsp_lib: Rc<RefCell<DSPNodeTypeLibrary>>,
 ) -> Rc<RefCell<BlockLanguage>> {
     let mut lang = BlockLanguage::new();
 
-//    lang.define(BlockType {
-//        category: "source".to_string(),
-//        name: "phse".to_string(),
-//        rows: 1,
-//        inputs: vec![Some("f".to_string())],
-//        outputs: vec![Some("".to_string())],
-//        area_count: 0,
-//        user_input: BlockUserInput::None,
-//        description:
-//            "A phasor, returns a saw tooth wave to scan through things or use as modulator."
-//                .to_string(),
-//        color: 2,
-//    });
-//
     lang.define(BlockType {
         category: "literals".to_string(),
         name: "zero".to_string(),
@@ -200,18 +190,6 @@ pub fn setup_hxdsp_block_language(
     //        color:          8,
     //    });
 
-//    lang.define(BlockType {
-//        category: "arithmetics".to_string(),
-//        name: "/%".to_string(),
-//        rows: 2,
-//        inputs: vec![Some("a".to_string()), Some("b".to_string())],
-//        outputs: vec![Some("div".to_string()), Some("rem".to_string())],
-//        area_count: 0,
-//        user_input: BlockUserInput::None,
-//        description: "Computes the integer division and remainder of a / b".to_string(),
-//        color: 8,
-//    });
-
     for fun_name in &["+", "-", "*", "/"] {
         lang.define(BlockType {
             category: "arithmetics".to_string(),
diff --git a/src/blocklang.rs b/src/wblockdsp/language.rs
similarity index 99%
rename from src/blocklang.rs
rename to src/wblockdsp/language.rs
index 61e5c8e..17dc369 100644
--- a/src/blocklang.rs
+++ b/src/wblockdsp/language.rs
@@ -1818,7 +1818,7 @@ mod test {
     #[test]
     fn check_blockfun_serialize_empty() {
         let dsp_lib = synfx_dsp_jit::get_standard_library();
-        let lang = crate::blocklang_def::setup_hxdsp_block_language(dsp_lib);
+        let lang = crate::wblockdsp::setup_hxdsp_block_language(dsp_lib);
         let mut bf = BlockFun::new(lang.clone());
 
         let sn = bf.save_snapshot();
@@ -1834,10 +1834,10 @@ mod test {
     #[test]
     fn check_blockfun_serialize_1() {
         let dsp_lib = synfx_dsp_jit::get_standard_library();
-        let lang = crate::blocklang_def::setup_hxdsp_block_language(dsp_lib);
+        let lang = crate::wblockdsp::setup_hxdsp_block_language(dsp_lib);
         let mut bf = BlockFun::new(lang.clone());
 
-        bf.instanciate_at(0, 0, 0, "+", None);
+        bf.instanciate_at(0, 0, 0, "+", None).unwrap();
 
         let sn = bf.save_snapshot();
         let serialized = sn.serialize().to_string();
diff --git a/src/wblockdsp/mod.rs b/src/wblockdsp/mod.rs
new file mode 100644
index 0000000..fc210df
--- /dev/null
+++ b/src/wblockdsp/mod.rs
@@ -0,0 +1,15 @@
+// Copyright (c) 2022 Weird Constructor <weirdconstructor@gmail.com>
+// This file is a part of HexoDSP. Released under GPL-3.0-or-later.
+// See README.md and COPYING for details.
+
+/*! Contains the implementation of the visual DSP programming language named WBlockDSP.
+
+*/
+
+mod definition;
+mod language;
+mod compiler;
+
+pub use definition::*;
+pub use language::*;
+pub use compiler::*;
diff --git a/tests/blocklang.rs b/tests/blocklang.rs
deleted file mode 100644
index 6eda8cd..0000000
--- a/tests/blocklang.rs
+++ /dev/null
@@ -1,86 +0,0 @@
-// Copyright (c) 2022 Weird Constructor <weirdconstructor@gmail.com>
-// This file is a part of HexoDSP. Released under GPL-3.0-or-later.
-// See README.md and COPYING for details.
-
-mod common;
-use common::*;
-
-//#[test]
-//fn check_blocklang_dir_1() {
-//    use hexodsp::block_compiler::{BlkJITCompileError, Block2JITCompiler};
-//    use hexodsp::blocklang::BlockFun;
-//    use hexodsp::blocklang_def;
-//
-//    let lang = blocklang_def::setup_hxdsp_block_language();
-//    let mut bf = BlockFun::new(lang.clone());
-//    block_fun.instanciate_at(0, 0, 1, "value", Some("0.3".to_string()));
-//    block_fun.instanciate_at(0, 1, 1, "set", Some("&sig1".to_string()));
-//
-//    let mut compiler = Block2JITCompiler::new(block_fun.block_language());
-//    let ast = compiler.compile(&block_fun)?;
-//    let lib = synfx_dsp_jit::get_standard_library();
-//    let ctx = synfx_dsp_jit::DSPNodeContext::new_ref();
-//    let jit = JIT::new(lib, dsp_ctx.clone());
-//    let fun = jit.compile(ASTFun::new(ast))?;
-//
-//    fun.init(44100.0, None);
-//
-//    let (s1, s2, ret) = fun.exec_2in_2out(0.0, 0.0);
-//
-//    ctx.borrow_mut().free();
-//}
-//
-//// XXX: Test case with 3 outputs, where the first output writes a value used
-////   by the computation after the first but before the third output.
-//
-//    0.3 ->3  set a
-//             => ->    + set b
-//                get a
-//             => ->    - set a
-//                get b
-//    get a +
-//    get b
-//*/
-//
-////#[test]
-////fn check_blocklang_2() {
-////    let (mut matrix, mut node_exec) = setup();
-////
-////    let block_fun = matrix.get_block_function(0).expect("block fun exists");
-////    {
-////        let mut block_fun = block_fun.lock().expect("matrix lock");
-////
-////        block_fun.instanciate_at(0, 0, 0, "get", Some("in1".to_string()));
-////        block_fun.instanciate_at(0, 0, 1, "value", Some("0.3".to_string()));
-////        block_fun.instanciate_at(0, 1, 0, "+", None);
-////        block_fun.instanciate_at(0, 2, 0, "set", Some("&sig1".to_string()));
-////
-////        block_fun.instanciate_at(0, 3, 0, "get", Some("in1".to_string()));
-////        block_fun.instanciate_at(0, 3, 1, "get", Some("in2".to_string()));
-////        block_fun.instanciate_at(0, 4, 0, "-", None);
-////        block_fun.instanciate_at(0, 5, 0, "->3", None);
-////
-////        block_fun.instanciate_at(0, 3, 5, "get", Some("in1".to_string()));
-////        block_fun.instanciate_at(0, 4, 5, "if", None);
-////        block_fun.instanciate_at(1, 0, 0, "value", Some("0.5".to_string()));
-////        block_fun.instanciate_at(2, 0, 0, "value", Some("-0.5".to_string()));
-////
-////        block_fun.instanciate_at(0, 6, 1, "set", Some("*a".to_string()));
-////        block_fun.instanciate_at(0, 6, 2, "set", Some("x".to_string()));
-////        block_fun.instanciate_at(0, 6, 0, "->", None);
-////        block_fun.instanciate_at(0, 7, 0, "->2", None);
-////
-////        block_fun.instanciate_at(0, 0, 3, "get", Some("in1".to_string()));
-////        block_fun.instanciate_at(0, 0, 4, "get", Some("in2".to_string()));
-////        block_fun.instanciate_at(0, 1, 3, "/%", None);
-////        block_fun.instanciate_at(0, 2, 3, "->", None);
-////        block_fun.instanciate_at(0, 3, 3, "/%", None);
-////        block_fun.instanciate_at(0, 4, 3, "set", Some("&sig2".to_string()));
-////        block_fun.instanciate_at(0, 4, 4, "set", Some("*ap".to_string()));
-////    }
-////
-////    matrix.check_block_function(0).expect("no compile error");
-////
-////    let res = run_for_ms(&mut node_exec, 25.0);
-////    assert_decimated_feq!(res.0, 50, vec![0.2; 100]);
-////}
diff --git a/tests/node_code.rs b/tests/node_code.rs
index 69fcf39..45ec533 100644
--- a/tests/node_code.rs
+++ b/tests/node_code.rs
@@ -5,7 +5,7 @@
 mod common;
 use common::*;
 
-use hexodsp::blocklang::BlockFun;
+use hexodsp::wblockdsp::BlockFun;
 
 fn setup() -> (Matrix, NodeExecutor) {
     let (node_conf, node_exec) = new_node_engine();
diff --git a/tests/wblockdsp.rs b/tests/wblockdsp.rs
deleted file mode 100644
index 4f51935..0000000
--- a/tests/wblockdsp.rs
+++ /dev/null
@@ -1,41 +0,0 @@
-// Copyright (c) 2022 Weird Constructor <weirdconstructor@gmail.com>
-// This file is a part of HexoDSP. Released under GPL-3.0-or-later.
-// See README.md and COPYING for details.
-
-mod common;
-use common::*;
-#[cfg(feature="synfx-dsp-jit")]
-use hexodsp::wblockdsp::*;
-
-#[cfg(feature="synfx-dsp-jit")]
-#[test]
-fn check_wblockdsp_init() {
-    let mut engine = CodeEngine::new();
-
-    let backend = engine.get_backend();
-}
-
-#[cfg(feature="synfx-dsp-jit")]
-#[test]
-fn check_wblockdsp_code_node() {
-    let (node_conf, mut node_exec) = new_node_engine();
-    let mut matrix = Matrix::new(node_conf, 3, 3);
-
-    let mut chain = MatrixCellChain::new(CellDir::B);
-    chain
-        .node_out("code", "sig")
-        .node_io("code", "in1", "sig")
-        .node_inp("out", "ch1")
-        .place(&mut matrix, 0, 0)
-        .unwrap();
-    matrix.sync().unwrap();
-
-    let mut chain = MatrixCellChain::new(CellDir::B);
-    chain
-        .node_out("code", "sig")
-        .node_io("code", "in1", "sig")
-        .node_inp("out", "ch1")
-        .place(&mut matrix, 0, 0)
-        .unwrap();
-    matrix.sync().unwrap();
-}