Diodes as mixing resistors?

[Tobyk]

Is this an amp project or a pedal project? It's rather easy to acquire cheap speakers and most of the old valco/supro amps weren't too complicated. If it's a pedal thing, you could also put a tiny speaker in a box with a microphone and get the real deal. Something like a spring reverb circuit would be a good start, just replace the tank with a speaker and a mic.

Yeah it’s a pedal thing but my main thread question is general. Speaker in a pedal is an interesting idea but might be too complicated in larger batches..