So this idea came from a friend of mine when I first showed him the proffieboard.
I’m pretty sure it isn’t possible currently, as far as I know, but thought it was interesting enough to ask what you all thought.
As a professional guitarist who uses a loop pedal multiple hours a day and a saber enthusiast, I find this riveting. 
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Oh, it’s definitely possible, but I’m not sure that a proffieboard would give you any advantage over some other board, like say a Teensy. Proffieboards have analog-capable pins, but the ADC is only 12-bit, so it’s never going to be “hifi”. I would also think that some electronics would be needed to adjust the input and output levels. Finally, there would need to be some code added to take the audio from the analog input instead of from the SD card, and the effects would need to be coded of course. The only effect that already exists is a high-pass filter. Even if you did all this, the amount of ram on the profieboard would limit the effects that can be implemented, as long delays or echos would be impossible.
I would use a teensy with an audio shield instead.
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