CV Gate sends pressure - not gate

[RJ-Eckie]

Here is roughly how the current cv gate output is calculated:

1. Take "volume" as a fraction of the pressure of a touch
   

   plinky_public/sw/Core/Src/plinky.c

   Line 2012 in a90cf75

   float vol = (synthf->pressure) * 1.f / 2048.f ; // sensitivity

2. Save the highest of the current touch pressures
   

   plinky_public/sw/Core/Src/plinky.c

   Line 2088 in a90cf75

   maxvol = maxi(maxvol, (int)(vol * 65536.f));

3. Send that as CV Gate voltage
   

   plinky_public/sw/Core/Src/plinky.c

   Line 2097 in a90cf75

   SetOutputCVGate(maxvol);

Issues:

• By convention, a CV Gate is a high/low voltage, not a scaled value
• Having a scaled value can have merit in certain situations, but the plinky already has a dedicated CV output with also outputs the maximum pressure: the CV Pressure out

It seems more logical and useful to have CV Gate output a binary 5V/0V signal