Thanks so much for the response! I do put the other tracks in safe. I have a 414, and have no problem with it; the "off" switch on each channel seems to make that easy. On the 424, I can record separate on 3 and 4, and stereo on 3 and 4 (one pass). I can record separate on 1 and 2 BUT, everytine I do, it bounces to the other. In other words if I record on 1, it also records automatically on two. If I record on 2, it also automatically records on 1. All of this I do by actually taking the mic, input it in the corresponding channel, which is less complicated for me to do. I will check out that tutorial.