I use it to mix two signals, a mic and a stompbox, and send them to the looper station. Before I took the signals to the mixer I boost each signal with a EQ pedal to neutralize the 10 Dbs fall you expect on a 3ch passive mixer.
It sounds great for 10 min, after that intensity on the signals starts to come and goes making it a nightmare to use. Probably there is something I am missing or is just a passive mixer dont fit this purpose.
I got me a portable power supply and an active mixer now to substitute this one and problem solved.
I guess it will be alright for a different use.