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I love teensy. The v4 (M7) part is crazy fast. Haven’t done much with their audio library (https://www.pjrc.com/teensy/td_libs_Audio.html) but it looks really great.
There’s also the Daisy audio board (https://www.electro-smith.com/daisy), which has a nice audio and MIDI API written around a SBC with external SDRAM as well. It will allow you to write a lot of algorithms from simple delay-based effects (chorus/flanger/filter/phaser/etc.) up to some other more memory-intensive algorithms. Think of it like an audio-specific Teensy. I definitely recommend the Cortex-M7 for doing more heavy effects work, but you can get away with simple delay-line effects on a Cortex-M4.