diff --git a/dev/src/dsp-definitions/44-c4-blops.ts b/dev/src/dsp-definitions/44-c4-blops.ts
index 153f802..d0f9029 100644
--- a/dev/src/dsp-definitions/44-c4-blops.ts
+++ b/dev/src/dsp-definitions/44-c4-blops.ts
@@ -6,27 +6,33 @@ import("stdfaust.lib");
 // consts
 peak = 0.65;
 threshold = peak * 0.02;
+highest_hz = 1320.0;
+shortest_cycle = ma.SR / highest_hz;
 
 // utils
 zero_crosses(x) = (x' > 0) != (x > 0);
 crossed_up(x) = (x' < 0) & (x >= 0);
+safe_divide(num, denom) = num / max(denom, 1) - num * (denom == 0);
 
 // process
 input = _;
 
 is_note_on = _ : an.amp_follower_ar(0.00001, 0.01) > threshold;
 
-devfn(x) = crosses,cycle
+devfn(x) = crosses,cycle,key,sine
 with {
   note_on = is_note_on(x);
   crosses = x : *(note_on) : crossed_up;
   crosses_on = crosses + (1 - note_on);
   cycle = ba.countup(10000, crosses_on') : ba.sAndH(crosses_on);
+  key = ba.if(cycle < shortest_cycle, 0.0, (ma.SR / cycle) : ba.hz2midikey : +(0.5) : floor);
+  sine = key : ba.midikey2hz : os.osc;
 };
 
-dev_crosses_on = _ : devfn : _,!;
-dev_cycle = _ : devfn : !,_;
-process = _ <: _,_;
+dev_crosses_on = _ : devfn : _,!,!,!;
+dev_cycle = _ : devfn : !,_,!,!;
+dev_key = _ : devfn : !,!,_,!;
+dev_sine = _ : devfn : !,!,!,_;
 `;
 
 const dspDefinition: DspDefinition = {
@@ -38,7 +44,7 @@ const dspDefinition: DspDefinition = {
   type: "offline",
   channels: 1,
   sampleRate: 48000,
-  output: ["input", "dev_crosses_on", "dev_cycle"],
+  output: ["input", "dev_crosses_on", "dev_cycle", "dev_key", "dev_sine"],
   outputLength: 48000 * 2.46,
   inputOffset: 1000,
 };