Ojsh

Good point Re: whistling range... Have now had some success: - humming loudly very close to mic, can sometimes get enough signal to register notes.  -...

Had just tried today with amplified electret (https://www.adafruit.com/product/1063) + voltage divider on output - increases sensitivity so easier to register notes now

Had some success doing a similar mod - pretty messy & ugly code changes at the moment, but can upload if it's of use to anyone - to light up...