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The ESP32 is a good alternative to the Teensy, plenty of processing power, runs Arduino code, and has all the peripherals you can dream of. Don’t know if a Teensy has WiFi, although no need for the synth project obvs.
Big benefit of the ESP is that they can be had at about the tenth of the price of a Teensy on AliExpress.
Tijmen
And it runs Arduino software, that's cool. I've got another project (which I started 4 years ago...) that uses an Arduino but the one I've got is a Duewhateverthefuck so a Teensy would be a massive upgrade, I think I'll get one.
Seeing as I've already got a Pi-Hole going I suppose it makes sense to use that. I didn't actually know the Pi had IO pins...