Since writing my previous post about the digital audio mixing I've made some significant progress. Initially my code was running on an off-the-shelf Teensy 4.1 and using only the digital input and output I could use directly with an external ADC/DAC. Shortly after writing that post I received the Teensy Audio Shield which makes the test setup a bit easier to deal with. Teensy Audio Board Rev. D2 This is a simple board that connects an NXP SGTL5000 codec chip to the Teensy. It provides a stereo i...