I have a simple time-keeping midi drum track routed to MTPower drums.
I set it to a level in order to hear it as I overdub a guitar part, but as soon as I start playing guitar in record mode, the drums get quieter. It happens on playback too - the drums are loud until the guitar comes in, when they immediately drop behind it.
This kinda suggests that there's some kind of limit on the Master, but if there is, I don't know how I've done it. And the meter on the Master doesn't seem to be peaking too high.
What am I missing?