Feeder back pedal

Before I go too far down the road, I’m thinking about using the DS to build a feedback pedal (think Digitech Freq). I’ve for both the Fun Box and Terrarium platforms, so really my concerns are around the coding and latency.

Seems to me I’d want to perform a FFT to analyze the signal, find the primary fundamental (note for mono, loudest note for a chord), and then use that to create the swell and any harmonics for the feedback note.

But, not sure if this process would create too much latency. I believe FFT analysis of the signal takes a lot of processing power.

So is this something that’s worth tackling?