I was wanting to use a Teensy to build a special high frequency microphone (to sample ultrasonic sounds).
I would like to implement this as a USB audio/sound card/microphone etc device. There are plenty of other HID device libraries such as keyboard and MIDI, but no 'sound card' or microphone.

Is there a Teensy project that I can use as a template to quickly get started to implement a USB Mic?

Thanks