I have been playing a regular gig where I take my electric bass and my elec. upright bass and switch between them several times during the set. I have several amps, but not one of them by itself can provide me two inputs, separate input gain, and the ability to have equal volume between the two instruments on stage. I don't want to use any device that requires stepping on an A/B box or similar thing becaue I barely have time as it is to get the next instrument in my hands and be ready to go by the end of the count off--songs are played back to back with with next count off starting immediately after one song ends. I am considering using a power amps for each bass and running the two signals into one cabinet, plugging them both into the parrallel inputs. Both amps will be on continuously, but only one bass will be played at a time. Is there any reason I should not do this? thanks.