Wally?
I don't think that pop is anything to worry about. Remember to turn down the Bose and turn off the L1 BEFORE you turn off any connected gear or mixers. ( ESPECIALLY mixers )

On a new note - The user saveable "scenes" in this new mixer are SO cool. I already set up a few presets that accomodate different mics, guitars etc..... I LOVE this thing. I gues I have to buy the power supply now, so I can use it with other amps in really small situations. Sigh ....... the money goes rollin' out .......
( but I LOVE the results ! )

Stay tuned....