#17 The drum solver and the audio interface

Picked one by one from a mixed channel. Transcript check: both title readers certain; 5 of 5 sampled certain picks confirmed by transcript, none failed. Channel rule: Include the numbered full-length course and lab lectures (e.g. '#1 -- Introduction to FPGA and Verilog', '#27 -- SPI', '#2 lab 1 ODE solver on FPGA'), but not the Q&A or intro clips. Include a student project demo only when its transcript shows a substantive technical walkthrough of how the system was designed and built.