This is a great suggestion! Another couple of ways to get started with analog signal processing: - Build an AM radio from transistors. There are lots of tuto

This is a great suggestion! Another couple of ways to get started with analog signal processing: - Build an AM radio from transistors. There are lots of tutorials out there. - Simulate circuits with Falstad's circuit.js. There are some interesting analog circuits already in the set of examples, like https://tinyurl.com/24gccg7p https://tinyurl.com/24gccg7p. - Build an Atari Punk. You can get very, very good op-amps very cheaply these days. Some of them even still come in through-hole packages. This makes it possible to build interesting audio synthesizer circuits for pennies that would have required significant money outlay in the 70s.