No, increasing volume didn't help. I think I found some weird "corner case" that confuses BIAB. I played around with different things, and found that if I change and delete some of the strings notes, then freeze the track, it plays AND creates wav file just fine. But it seems that if I delete several notes and then ADD some different ones, the wav conversion doesn't pick up strings. Very strange! I managed to create my mp3 pretty close to what I want, so I'm good for now. BTW, if anyone is curious, trying to emulate the string intro to Glen Campbell "By The Time I Get To Phoenix".