I didn't want to run away off with another post called
Comping Questions
so here's a new one on a similar subject.
I had to re-install X3 Producer. When completed I recorded some vocals and re-recorded them a few times. I noted that prior vocals were not muted. I took a look at the "record" settings and found the box called "comp" checked. I understand that when checked, prior recordings are supposedly automatically muted. This time, I am 98% certain they were not. I went into the overwrite mode to mute the prior recordings. I mention this only to suggest that perhaps a bug exists. Added edit ... I know that sometime during the re-install I updated the Sonar X3 with X3e. It may have been after my experiencing the problem that I suggested may be a bug. I just re-checked and the comp setting seems to function properly.