I'm trying to Engineer a super low cost prototype controller for PD. Currently I understand that in order to interface potentiometers (or any sensor / AD converter) with PD you need at minimum a BASIC STAMP or some other PIC embedded device. My question is, can this be done at a lower level without a micro-controller?
Essentially I just need to send on/off control signals and numbers/values (1-128 for knobs or sliders) for PD to use. Is it possible to send some (non standard) digital signal to PD along a USB - how flexible would this process be?
What is the lowest level signal PD will accept?