Great ideas Brach, thank you! I was thinking of going even smaller with an ATTiny84 (the 85 doesn’t have sufficient I/O) but by using the Pro Micro I can easily incorporate a dip switch and was thinking of another mode of ‘hold FSW for x seconds’ to toggle mode. For now I’m going with the design as it is because I really must get on with finishing my Quaverato Kit!
By staying with the ProMicro (that has built in USB for programming) it’ll be easy to change the code to, for example, increase the presets to 8, I could then use it on my Source Audio Collider