I do not use the looper live. (see above.). If I want di do this I would use another device.
Normally I play the rythm not so loud as the solo.
But anyway - A volume control for the looper would be nice.
I play the solo 6 dB louder than the rhythm, as mentioned in my previous post. I noticed that, when i make the solo sound 8dB louder than the rhythm part when using the looper, the solo starts to stand out.