So I recorded one track and am now attempting to add another track. R and I are enabled on the new track to be recorded and I can hear the signal. However, when I press Play to hear the already recorded track and play along to it, I'm not getting the new signal through my headphones. When I stop Play, then I can hear the new signal. Press Play, the new signal goes away (through the monitors). I want to be able to practice along to the pre-recorded track before recording the new track but I need to hear it. Any suggestions?