• Provide mixed down kits online which just output on the first two channels
• Create an own plugin which is super simple and has only two outputs

The first approach currently seems more promising.

Maybe this whole thing is just a stupid idea…

Marking stereo pairs in the channel maps in the xml would be useful for automatic stereo downmixing.

Stereo downmix toggle button in the UI?

• Drumkit file channel map has stereo channels marked with either left or right.
• When active only the first two plugin output channels are used and marked stereo instrument channels are mapped to either output ch1 or ch2, the rest are mapped to both.