I'm looking to use a MCU for audio sampling. I want to sample incoming audio and pitch shift it (without speeding it up/slowing it down). A bit about the build. I'm planning to make a circuit board that can take in a single audio source and output three or four different pitch-shifted sounds in real time, with each output being its own pitch-shifted sound. If possible, I would like to have a potentiometer for each output that could in effect change how pitch shifted each output is, sort've of like a tuning knob. These outputs will eventually get summed together to produce a chord-like sound.
I'm not quite sure what exact requirements are needed for this, just that the sampling rate should be around 44KHz (standard audio sampling rate). Of course, I would like the outputs to replicate the original sound as much as possible, just pitch-shifted. I am assuming as well that the way I pitch-shift and sample could affect the requirements. Also, I would like to avoid SMT if I can.
Given these requirements, what do you suggest the best MCU to use is? I would like to use Arduino to program the MCU. I really only need the chip itself (I think?), as I plan to create a separate circuit board for this (although would I need an Arduino board to initially program the chip?)
I'm fairly new to the Arduino world, so apologies in advance if I miss something obvious or mess up terminology. I do come from a background in analog circuitry and programming though. Just looking for as much help as I can get from people who know more than me but am eager to learn about this all.