diff --git a/src/dsp/mod.rs b/src/dsp/mod.rs
index 24f3258..3d0dde5 100644
--- a/src/dsp/mod.rs
+++ b/src/dsp/mod.rs
@@ -101,7 +101,7 @@ pub trait GraphAtomData {
     fn get_led(&self) -> f32;
 }
 
-pub type GraphFun = Box<dyn FnMut(&dyn GraphAtomData, bool, f32) -> f32>;
+pub type GraphFun = Box<dyn FnMut(&dyn GraphAtomData, bool, f32, f32) -> f32>;
 
 /// This trait represents a DspNode for the [crate::matrix::Matrix]
 pub trait DspNode {
diff --git a/src/dsp/node_ad.rs b/src/dsp/node_ad.rs
index c1c8a2d..ae15f5e 100644
--- a/src/dsp/node_ad.rs
+++ b/src/dsp/node_ad.rs
@@ -234,7 +234,7 @@ impl DspNode for Ad {
     }
 
     fn graph_fun() -> Option<GraphFun> {
-        Some(Box::new(|gd: &dyn GraphAtomData, _init: bool, x: f32| -> f32 {
+        Some(Box::new(|gd: &dyn GraphAtomData, _init: bool, x: f32, xn: f32| -> f32 {
             let atk_idx  = NodeId::Ad(0).inp_param("atk").unwrap().inp();
             let dcy_idx  = NodeId::Ad(0).inp_param("dcy").unwrap().inp();
             let ashp_idx = NodeId::Ad(0).inp_param("ashp").unwrap().inp();
@@ -248,7 +248,9 @@ impl DspNode for Ad {
             let a = atk * 0.5;
             let d = dcy * 0.5;
             if x <= a {
-                if a < 0.0001 {
+                if xn > a {
+                    1.0
+                } else if a < 0.0001 {
                     0.0
                 } else {
                     let delta = 1.0 - ((a - x) / a);
diff --git a/src/dsp/node_test.rs b/src/dsp/node_test.rs
index 5c6a057..fa16d08 100644
--- a/src/dsp/node_test.rs
+++ b/src/dsp/node_test.rs
@@ -121,7 +121,7 @@ impl DspNode for Test {
     }
 
     fn graph_fun() -> Option<GraphFun> {
-        Some(Box::new(|_gd: &dyn GraphAtomData, _init: bool, x: f32| -> f32 {
+        Some(Box::new(|_gd: &dyn GraphAtomData, _init: bool, x: f32, _xn: f32| -> f32 {
             x
         }))
     }