We just picked up a JVC GY-HM150u at work, and we're having trouble with manual audio. We have a line out from the board going into channel 1, and we have channel 2's input set to one. When we try to manually set the levels, we don't get a level from channel one and get a normal signal in ch.2. However, if we set ch.1 to AUTO, we will get a signal in both channels. We've tested this with a few different configurations, and it still happens.