shortcolin on Nostr: From what I can tell the pippyg microphone software comes from but has extra digital ...

From what I can tell the pippyg microphone software comes from https://github.com/ArmDeveloperEcosystem/microphone-library-for-pico but has extra digital filtering - the source (for the microphone only) is available somewhere in a Google drive file on the site. Sparkfun sell a SPH8878LR5H microphone breakout which might be similar - have ordered one and going to try with a Pico to make a microphone and see what happens.