Reversing the Harman&Kardon Sound System Protocol

The goal of this project is to decode, reverse, and use the serial protocol used for controlling the tape deck, amp, CD, and Tuner.

Quantity		Component name
1	×	Harman & Kardon Festival 500
1	×	Saleae Logic Analyzer (and SW)
1	×	AC cheap-o power supply
1	×	RP2040 pico
1	×	Relais for Power supply
1	×	Cheap RCA socket USB sound card (Or use your existing...)