[S] Mixing Instruments to create a unique one

[kae]

It's a bit difficult and time consuming when you're placing markers for multiple different instruments you've used to make one sound. For example, if you wanted to detune one melody that you made by overlapping multiple instruments, it takes quite a bit of time. We should be able to create a unique instrument/make presets for instruments, the same way we have the number hotkeys for instruments. It'd be pretty helpful, and also being able to maybe have a separate page for soundfonts/presets you've created.