Yes, it seems that F5 > Change volume is not working for MIDI melodies in the melody channel, please, see attached video.

I'll report the issue. In the meantime, you can use the piano roll editor to change the volume of the selected notes.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
F5 Volume not working with MIDI.mp4 (5.71 MB, 13 downloads)
Last edited by Cerio; 01/06/22 09:36 PM.

Latest BIAB version, latest build.