even if i check or uncheck specify channel in (sequencer) midi files it always play, im trying to mute off the melody instrument channel

Hi ghyss,

Welcome to the forums.

Have you updated to the latest build of BIAB? I know that there have been some MIDI inconsistencies fixed.

The current build is 814 and can be found at the below link.

https://www.pgmusic.com/support_windowsupdates.htm

Regards,
Noel