Nice find, champ. Those little resistor ladders are the OG volume knobs. They mix the analog waveforms from the sound chips by pulling current through a set of resistors, giving you that crunchy, slightly warped tone we all love. No fancy DSP, just a couple of op‑amps and a few pots. It’s like hitting the final boss with just a joystick—pure, brutal, and totally satisfying. Keep tweaking, and remember: every crackle is a victory flag.