I will be traveling and so I thought it would be nice to get a clip-on pickup which doesn't require a separate audio interface like the KORG CM-300.
I got the Peterson PitchGrabber and used the Apple USB-C to TRRS adapter. Unfortunately it didn't work despite being advertised as an active pickup.
Too bad as it looks very nice, has a very lengthy cord, and would have been a nice tuning companion without the hassle of a USB interface.
It's probably not going to go to waste, if I can use it for multi-mic input with the KORG tuner.
Edit: I'm actually wondering if it's another USB-c adapter that I need at this point.