OK Bose you really need a master volume, let me set my guitar, and mic and then use the master for increasing that volume without fumbling around again with both mic and guitar volumes. You could also use a boost for low signal items like dynamic mics, and maybe add phantom power. While you are at it an effect send and return, three band eq, gain, notched cancelling eq for feedback issues and reverb. I own two Trace Elliot cubes they are old, about 15-20 years can't find a date on them work like a champ, line out, DI, effects, send and return, reverb, three band eq. notched feedback control, gain, 35 to 70 watts max output, carrying case with shoulder strap oh did I mention it is 7 inches, square, made about 20 years ago. The only drawback using them today is that they need electricity, not battery capable. Built like a rocket. Surely we can build a better sounding unit today without cutting out the basic features. What do say Bose?