"have you tried turning up the volume in the biab mixer instrument trak ...eg drums whatever OR is it set to max already ?? are we talking midi or audio traks ??"

Yes, that just distorts the output.

"if your useing on board pc sound (which i dont recommend if your recording also..)..."

I'm not recording yet and would use a different approach. Just playing MP3 tracks tnrough my amp for live performance

"look at your pc playback win doze level....it might be turned down in windows settings for playback."

There's no problem with play back on my PC from BIAB live, or with other non BIAB MP3.