Noise changes output based on state

src/droplets/noise_droplet.cpp

@@ -14,7 +14,14 @@ void NoiseDroplet::Control() {}
 void NoiseDroplet::Process(float** in, float** out, size_t size) {
   for (size_t i = 0; i < size; i += 2) {
     float sig = noise.Process();
-    for (size_t chn = 0; chn < 4; chn++) {
+    size_t chn_min = 0;
+    size_t chn_max = 4;
+    if (state == DropletState::kLeft) {
+      chn_max = 2;
+    } else if (state == DropletState::kRight) {
+      chn_min = 2;
+    }
+    for (size_t chn = chn_min; chn < chn_max; chn++) {
       out[chn][i] = sig;
     }
   }