aserts if UNPROCESSED input used during calibration

[philburk]

To Reproduce:

1. Insert funplug.
2. Increase volume to about 80%.
3. Launch app
4. Enter Setting using gear icon at top right.
5. Set "Microphone Source" to "UNPROCESSED".
6. Click "Back" icon
7. Click "Calibrate Sound Level Now"

EXPECT
Calibration to succeed.

ACTUAL
App crashes with an assert.
An excerpt of the log file is attached. log_loopback_assert.txt

Here are a few lines:
10-04 17:46:44.764 F DEBUG : signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
10-04 17:46:44.767 F DEBUG : Abort message: 'ASSERTION FAILED: 0x0 != 0x2
10-04 17:46:44.771 F DEBUG : #2 pc 000000000001501c /data/app/org.drrickorang.loopback-kx-gm_2skZEYAw5fB5LFhw==/lib/arm64/libloopback.so (slesInit+2536)
10-04 17:46:44.771 F DEBUG : #3 pc 0000000000016334 /data/app/org.drrickorang.loopback-kx-gm_2skZEYAw5fB5LFhw==/lib/arm64/libloopback.so

[gkasten]

Thanks for reporting this. I will plan to reproduce soon, but if I forget then please remind me.