diff --git a/tests/common/mod.rs b/tests/common/mod.rs
index 647a202..30d3eb4 100644
--- a/tests/common/mod.rs
+++ b/tests/common/mod.rs
@@ -611,6 +611,10 @@ pub fn fft(buf: &mut [f32], size: FFT, amp_thres: u32) -> Vec<(u16, u32)> {
     for (i, amp) in amplitudes.iter().enumerate() {
         if *amp >= amp_thres {
             let freq = (i as f32 * SAMPLE_RATE) / len as f32;
+            if freq > 22050.0 {
+                // no freqency images above nyquist...
+                continue;
+            }
 //            println!("{:6.0} {}", freq, *amp);
             res.push((freq.round() as u16, *amp));
         }
diff --git a/tests/node_bosc.rs b/tests/node_bosc.rs
new file mode 100644
index 0000000..af51fa8
--- /dev/null
+++ b/tests/node_bosc.rs
@@ -0,0 +1,88 @@
+mod common;
+use common::*;
+
+#[test]
+fn check_node_bosc_1() {
+    let (node_conf, mut node_exec) = new_node_engine();
+    let mut matrix = Matrix::new(node_conf, 4, 4);
+
+    let bosc  = NodeId::BOsc(0);
+    let out  = NodeId::Out(0);
+    matrix.place(0, 0, Cell::empty(bosc)
+                       .out(None, None, bosc.out("sig")));
+    matrix.place(0, 1, Cell::empty(out)
+                       .input(out.inp("ch1"), None, None)
+                       .out(None, None, None));
+    pset_s(&mut matrix, bosc, "wtype", 0); // Sine
+    pset_d(&mut matrix, bosc, "freq", 220.0);
+    matrix.sync().unwrap();
+
+    run_for_ms(&mut node_exec, 10.0);
+    let fft = run_and_get_fft4096_now(&mut node_exec, 20);
+    assert_eq!(fft[0].0, 194);
+    assert_eq!(fft[1].0, 205);
+    assert_eq!(fft[2].0, 215);
+    assert_eq!(fft[3].0, 226);
+    assert_eq!(fft[4].0, 237);
+    assert_eq!(fft[5].0, 248);
+
+    pset_s(&mut matrix, bosc, "wtype", 1); // Triangle
+    let fft = run_and_get_fft4096_now(&mut node_exec, 20);
+    assert_eq!(fft[0].0, 194);
+    assert_eq!(fft[1].0, 205);
+    assert_eq!(fft[2].0, 215);
+    assert_eq!(fft[3].0, 226);
+    assert_eq!(fft[4].0, 237);
+    assert_eq!(fft[5].0, 646);
+    assert_eq!(fft[6].0, 657);
+    assert_eq!(fft[7].0, 668);
+    assert_eq!(fft[8].0, 1098);
+    assert_eq!(fft[9].0, 1109);
+
+    pset_s(&mut matrix, bosc, "wtype", 2); // Saw
+    let fft = run_and_get_fft4096_now(&mut node_exec, 120);
+    assert_eq!(fft[0].0, 205);
+    assert_eq!(fft[1].0, 215);
+    assert_eq!(fft[2].0, 226);
+    assert_eq!(fft[3].0, 431);
+    assert_eq!(fft[4].0, 441);
+    assert_eq!(fft[5].0, 452);
+    assert_eq!(fft[6].0, 657);
+    assert_eq!(fft[7].0, 668);
+    assert_eq!(fft[8].0, 883);
+    assert_eq!(fft[9].0, 1098);
+
+    pset_s(&mut matrix, bosc, "wtype", 3); // Pulse
+    pset_n(&mut matrix, bosc, "pw", 0.0);  // Pulse width no mod
+    run_for_ms(&mut node_exec, 10.0);
+    let fft = run_and_get_fft4096_now(&mut node_exec, 120);
+    assert_eq!(fft[0].0, 205);
+    assert_eq!(fft[1].0, 215);
+    assert_eq!(fft[2].0, 226);
+    assert_eq!(fft[3].0, 237);
+    assert_eq!(fft[4].0, 646);
+    assert_eq!(fft[5].0, 657);
+    assert_eq!(fft[6].0, 668);
+    assert_eq!(fft[7].0, 1098);
+    assert_eq!(fft[8].0, 1109);
+    assert_eq!(fft[9].0, 1540);
+    assert_eq!(fft[10].0, 1981);
+
+    pset_n(&mut matrix, bosc, "pw", 1.0);  // Pulse width no mod
+    run_for_ms(&mut node_exec, 10.0);
+    let fft = run_and_get_fft4096_now(&mut node_exec, 120);
+    assert_eq!(fft[0].0, 215);
+    assert_eq!(fft[1].0, 226);
+    assert_eq!(fft[2].0, 431);
+    assert_eq!(fft[3].0, 441);
+    assert_eq!(fft[4].0, 452);
+    assert_eq!(fft[5].0, 657);
+    assert_eq!(fft[6].0, 668);
+    assert_eq!(fft[7].0, 872);
+    assert_eq!(fft[8].0, 883);
+    assert_eq!(fft[9].0, 1098);
+    assert_eq!(fft[10].0, 1109);
+    assert_eq!(fft[11].0, 1314);
+    assert_eq!(fft[12].0, 1324);
+    assert_eq!(fft[13].0, 1540);
+}