I'm trying to decide between the Markbass Big Bang or the Little Mark Tube 800. I want to be able to plug my iPhone/iPad (with keyboard for keyboard bass sounds) or a synth (mono or stereo) into the amp simultaneously for gigs, not just practicing. Big Bang = aux input without gain control (stereo summing?) Little Mark Tube 800 = second mono input with gain control Is there an advantage to using an aux input with iPhone instead one side of a splitter cable into a mono input? Is the aux actually a stereo input that sums both sides or is it just doing the same thing you would with a splitter cable into a mono input & only taking one side while the other is disconnected? Which is the better method for sound quality of the iPhone/synth, and does it make a difference? I haven't been able to find this information anywhere and Markbass haven't responded to my enquiry.