Day 3 & 4 - Audio is now playing! Found a library called arduino-audio-tools that conveniently abstracts the MP3 -> PCM -> I2S pipeline, so no need to reinvent the wheel. This library provides functions like setVolume(), play(), and stop(). All I had to do was integrate these functions into my rotary encoder code from Day 1, and voila there’s volume control and pause/resume. The next session will likely be debugging the static & flicker coming out of the TRRS headphone jack