I built a Raspberry Pi based loop station: https://youtu.be/S_rkdmCzIO0
This thing lets me use mobile looper apps on stage or for recording.
It's a simple connector/adaptor/interface that lets me connect a mic and guitar into my phone, and my phone into a PA system/mixer.
the apps from the screenshots are here https://play.google.com/store/apps/details?id=com.appotica.loopr
and here https://play.google.com/store/apps/details?id=rubberbigpepper.Looper
Music:
Long Stroll by Kevil MacLeod
#psychotenuse