my amp has both "high" and "low" input ports, as most amps do. i obviously plug my bass into the high and cuz i wanted to play along with a song on my ipod, i plugged that into the low. i wanted to turn my bass up, so i used the volume knob on the bass itself. doing so doesn't turn my bass up, but what was playing on my ipod. i dunno if it's a dumb question or not, but how/why does this happen? and... what's possibly a better way to be able to hear my ipod while playing along on my bass?