Fixed #3 - debounce Moots gate voltages using hysteresis.

Gate voltages are not always ideally square.
They can contain Gibbs ripple, leading to unintended rapid toggling.
Now Moots follows the recommended levels and behavior as explained at:
https://vcvrack.com/manual/VoltageStandards#Triggers-and-Gates

When one of the 5 controllers has a gate voltage connected,
it will stay off until the gate voltage reaches 1.0V or higher.
Then it will turn on and stay on until the gate voltage
descends to 0.1V or lower, causing it to turn off.
Thus any voltage greater than 0.1V and lower than 1.0V
will leave the controller's on/off state unchanged.

The controllers default to being off, and are turned back off
during a reset, so they have a well-defined state if
the initial gate voltage is inside the 0.1V .. 1.0V
gray area at startup/reset.

src/moots.cpp

@@ -48,8 +48,19 @@ struct Moots : Module
         LIGHTS_LEN
     };
 
+    static const int NUM_CONTROLLERS = 5;
+    static_assert(NUM_CONTROLLERS == PARAMS_LEN);
+    static_assert(NUM_CONTROLLERS == OUTPUTS_LEN);
+    static_assert(NUM_CONTROLLERS == LIGHTS_LEN);
+    static_assert(2*NUM_CONTROLLERS == INPUTS_LEN);
+
+    bool isGateActive[NUM_CONTROLLERS];
+
     Moots()
     {
+        for (int i = 0; i < NUM_CONTROLLERS; ++i)
+            isGateActive[i] = false;
+
         config(PARAMS_LEN, INPUTS_LEN, OUTPUTS_LEN, LIGHTS_LEN);
         configButton(TOGGLEBUTTON1_PARAM, "Moot 1");
         configButton(TOGGLEBUTTON2_PARAM, "Moot 2");
@@ -73,11 +84,19 @@ struct Moots : Module
         configOutput(OUTAUDIO5_OUTPUT, "Signal 5");
     }
 
+    void onReset(const ResetEvent& e) override
+    {
+        Module::onReset(e);
+
+        for (int i = 0; i < NUM_CONTROLLERS; ++i)
+            isGateActive[i] = false;
+    }
+
     void process(const ProcessArgs& args) override
     {
         float volts[PORT_MAX_CHANNELS];
 
-        for (int i = 0; i < PARAMS_LEN; ++i)
+        for (int i = 0; i < NUM_CONTROLLERS; ++i)
         {
             auto & gate = inputs[INGATE1_INPUT + i];
 
@@ -86,7 +105,20 @@ struct Moots : Module
             {
                 // If the gate input is connected, use the voltage of its first channel
                 // to control whether the output is enabled or disabled.
-                active = gate.getVoltage(0) >= 4.0f;
+                // Debounce the signal using hysteresis like a Schmitt trigger would.
+                // See: https://vcvrack.com/manual/VoltageStandards#Triggers-and-Gates
+                const float gv = gate.getVoltage(0);
+                if (isGateActive[i])
+                {
+                    if (gv <= 0.1f)
+                        isGateActive[i] = false;
+                }
+                else
+                {
+                    if (gv >= 1.0f)
+                        isGateActive[i] = true;
+                }
+                active = isGateActive[i];
             }
             else
             {