Foam v1
Foam is directly based on the way I ended up implemented the LFO in Möist. It uses an LDR (light dependant resistor) in parallel with the Time knob as the way to get an extra delay time depth control. So when I had the first prototype of Möist in front of me I started experimenting with switching out the LDR for other components.
I landed on using an FSR (force sensitive resistor) since it naturally is really fun to control delay time by pressing down on something. So coming up with a fun design to make this both interesting and foot safe for the user was the real challenge. The original Foam also has a second FSR that controls something it probably should not. But in V.2 I pulled it back and designed it around a larger FSR to have more of a pressure area for the user.
Foam v1 User Guide
The pedal uses 9VDC power (2.1mm jack: center-negative).
Controls:
The top “M” knob is your MIX control. From dry only, to introducing delay, to slight boost/overdriving of the delay lines.
The center “Triangle” knob is your delay-time control. It works just like any regular time control, with the added function of setting the range of the big Circle pressure sensor.
The bottom “Circle” knob is your delay Repeats/Feedback control. It controls the amount of delay repeats and can also feedback if you max it fully clockwise.
On top of that it also controls the big Triangle pressure sensor. Dial it back and the sensor will make the pedal behave pretty broken. It will start to bitcrush and get sort of radio hi-passy and noisy. If you dial it all the way back the sensor will just cut the delay signal completely.
But going clockwise and the pedal will sing like no other pedal with some huge droning feedback.
The big “CIRCLE SENSOR” is a pressure sensitive time control. The harder you press the longer the delay time. Control the range with the knob. To far and the time will be longer than the PT2399 can handle (which is amazingly lofi). Create your own vibratos, tap it quickly from time to time to blip in time, or just go completely nuts with it!
The big ““TRIANGLE SENSOR” is a pressure sensitive feedback drone. Pressing it will make the pedal start droning and singing. You can control that with how hard you press it. It is however NOT simply controlling a natural delay feedback. It’s a lot more foam.
A byproduct of this is that if you dial back the feedback control (Circle knob) you get a ton of extra lofi goodness. And of course combining pressure on both the CIRCLE and TRIANGLE Sensors will get you straight to wherever you did not know you wanted to go right now!