Allow use of capture input and one of the stereo outputs as a moveable effects loop block

[bue257]

This one f. e.

An FX Loop

Option to use the capture out - capture in as an FX loop! Even though this would disable stereo output, I think much more players would be able to integrate the NC into their setup with a FX loop. This would also make capturing OD pedals and multiple OD pedals easier.