The overall question about midi volumes has nothing to do with Biab or any other midi playback program. When someone creates a midi file they obviously have to use a synth to hear what they're doing. They will balance the parts according to that synth and it sounds good TO THEM. You as a user may not have the same synth that was used to create the file and even if you did what sounded great to the original creator of that file may not be how you want to hear it. If you're using a GM synth one of the big differences between GM synths is how they balanced the individual instruments. The TTS 1 did it their way, Ketron does it their way, etc. Rebalancing all that is up to the user and especially with midi drum kits. They can be all over the place and what you pay for with a midi drum synth module other than the sounds themselves is the midi control they give you. Not all midi editing features are the same, far from it. Biab gives you some control but it's really the synth you're using that's the most important part of this.

Biab is based on GM and it gives you the basic framework of your song and sounds but it's up to you to take that and customize it however you want. It's not simply plug and pray.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.