diff --git a/dev/src/dsp-definitions/07-param-layers.ts b/dev/src/dsp-definitions/07-param-layers.ts
index aefb2f3..de8e905 100644
--- a/dev/src/dsp-definitions/07-param-layers.ts
+++ b/dev/src/dsp-definitions/07-param-layers.ts
@@ -3,23 +3,26 @@ import type { DspDefinition } from "../types";
 const dsp = `
 import("stdfaust.lib");
 
+isFirstTick = ba.time == 0;
+sAndHWithDefault(default, trig, x) = ba.sAndH(isFirstTick | trig, select2(isFirstTick, x, default));
+
 changed(x) = x != x';
 
 layerIsAwake(l,x,t) = return with {
-    layerChange = l : changed;
-    startPos = x : ba.sAndH(layerChange);
-    nudged = abs(x - startPos) > t;
-    return = layerChange,nudged : ba.on_and_off : _ == 0;
+  layerChange = l : changed;
+  startPos = x : ba.sAndH(layerChange);
+  nudged = abs(x - startPos) > t;
+  return = layerChange,nudged : ba.on_and_off : _ == 0;
 };
 
-layerValue(l,i,x) = return with {
-    return = x : ba.sAndH((l == i) & layerIsAwake(l,knob,0.1));
+layerValue(l,i,t,x) = return with {
+  return = x : sAndHWithDefault(0.5, (l == i) & layerIsAwake(l,knob,t));
 };
 
 layer = hslider("layer", 0.0, 0.0, 2.0, 1.0);
 knob = hslider("knob", 0.0, 0.0, 1.0, 0.001);
 
-layerOutput(i) = layerValue(layer,i,knob): hbargraph("value %i", 0.0, 1.0);
+layerOutput(i) = layerValue(layer,i,0.1,knob): hbargraph("value %i", 0.0, 1.0);
 
 process = par(i, 3, layerOutput(i));
 `;
diff --git a/dev/src/dsp-definitions/31-echoloop-live.ts b/dev/src/dsp-definitions/31-echoloop-live.ts
index 11c9090..5be7b15 100644
--- a/dev/src/dsp-definitions/31-echoloop-live.ts
+++ b/dev/src/dsp-definitions/31-echoloop-live.ts
@@ -1,28 +1,97 @@
 import type { DspDefinition } from "../types";
 
+// L -> send -> sum ---> L
+//               ^
+//            delay(main)
+// R ------------+---- delay(offset) -> R
+
+// foo[OWL:A], bar[OWL:B]
+
 const dsp = `
 import("stdfaust.lib");
 
-loop_delay_time = hslider("delay time", 500.0, 0.0, 1000.0, 0.1) * 0.001 * ma.SR;
-loop_delay = de.delay(ma.SR, loop_delay_time);
-fb_loop = loop_delay;
+//
+// param layers
+//
+
+changed(x) = x != x';
 
-right_channel_delay_time = hslider("right channel delay time", 250.0, 0.0, 1000.0, 0.1) * 0.001 * ma.SR;
-right_channel_delay = de.delay(ma.SR, right_channel_delay_time);
+sAndHWithDefault(default, trig, x) = return with {
+  isFirstTick = ba.time == 0;
+  sample = select2(isFirstTick, x, default);
+  return = ba.sAndH(isFirstTick | trig, sample);
+};
+
+layerIsAwake(l,x,t) = return with {
+  layerChange = l : changed;
+  startPos = x : ba.sAndH(layerChange);
+  nudged = abs(x - startPos) > t;
+  return = layerChange,nudged : ba.on_and_off : _ == 0;
+};
+
+layerValue(d,l,i,t,x) = return with {
+  return = x : sAndHWithDefault(d, (l == i) & layerIsAwake(l,x,t));
+};
+
+//
+// bitcrusher
+//
+
+bitcrusher(nbits,x) = return with {
+  // floor(x) = x : int;
+  scaler = float(2^nbits - 1);
+  return = floor(x * scaler) / scaler;
+};
 
-dry_volume = hslider("dry", 1.0, 0.0, 1.0, 0.01);
-dry(x) = x * dry_volume;
+//
+// params
+//
 
-wet_volume = hslider("wet", 0.5, 0.0, 1.0, 0.01);
-wet(x) = x * wet_volume;
+dry_volume_param = hslider("dry", 1.0, 0.0, 1.0, 0.01);
+wet_volume_param = hslider("wet", 0.5, 0.0, 1.0, 0.01);
 
-feedback = hslider("feedback", 0.5, 0.0, 1.0, 0.01);
+button_alt = checkbox("alt[OWL:B1]");
+button_snapshot = button("snapshot[OWL:B2]");
 
-dsp(l, r) = (l + r * feedback), (r : right_channel_delay);
+time_param = hslider("time[OWL:A]", 500.0, 0.0, 1000.0, 0.1);
+feedback_param = hslider("feedback[OWL:B]", 0.5, 0.0, 1.0, 0.01);
+
+//
+// param layers
+//
+
+delay_left_time = time_param : layerValue(500.0, button_alt, 0, 10.0) * 0.001 * ma.SR;
+delay_right_time = time_param : layerValue(250.0, button_alt, 1, 10.0) * 0.001 * ma.SR;
+
+delay_left = de.delay(ma.SR, delay_left_time);
+delay_right = de.delay(ma.SR, delay_right_time);
+
+feedback_amount = feedback_param : layerValue(0.5, button_alt, 0, 0.05);
+bitcrush_amount = feedback_param : layerValue(1.0, button_alt, 1, 0.05);
+
+//
+// dsp
+//
+
+feedback_path(x) = (x * feedback_amount) : delay_left : bitcrusher(bitcrush_amount * 16.0);
+dsp(l, r) = (l + (r : feedback_path)), (r : delay_right);
+
+//
+// simulated feedback loop
+//
+
+feedback_loop = _;
+
+//
+// routing
+//
 
 loop(dsp, fb, l) = (l, fb : dsp), fb;
 lr(l, r) = r, l;
-alchemist(dsp, x) = x : loop(dsp) ~ fb_loop : !,_,_ : lr;
+alchemist(dsp, x) = x : loop(dsp) ~ feedback_loop : !,_,_ : lr;
+
+dry(x) = x * dry_volume_param;
+wet(x) = x * wet_volume_param;
 
 echoloop(dsp, l, r) = out
 with {