First, thank you for the awesome app and great tutorials.
I discovered some bug, not critical for me, because I can use another app for recording, as loopers of free recorder from Sony (both can record from my USB mic M-Audio Vocal Studio bwt). In case with loopers it's convenient to use metronome for recording vocals such as acapellas. In case with plain recorder you can use metronome in background, and it's pretty cool. But yet it's disappointing to miss so convenient function in such a wonderful program.
I use Xiaomi Redmi Note 4X 3/32 GB
After switching to another app or desktop and back Caustic unable to record audio. Monitoring indicator (mono) shows latest input value. After exit recording works thou.
I think reinitialization of input audio device after resume to the application can help.
Also I ready to help with testing on my device.
Android 7.0 NRD90M
MIUI Global 8.5 Stable 126.96.36.199(NCFMIED)
Kernel version: 3.18.31-perf-ge702831