Here is an area where I am a bit indecisive with building my own library/kit using my own samples.
The issue is, the Mixer in GA is kit-preset based, and there for GA Instruments don’t and could not recall the mixer.
Now, topology wise, GA Sample/Instruments already contain a virtual mixer in the form of the volume knob per sample, which can be set per layer in instrument by turning on Edit: Selected instead of Edit: Pad.
But I think it would be much more tangible to just have a Mixer GUI per pad/sample/instrument when you are in Layer mode. Each time you add a layer, it adds a channel to the mixer and auto-names it to the layers sample file name (could be user renamed after).
Just simple mixer, no inserts or anything fancy.
This would be separate from the sample/layers volume knob which users would continue as is to set initial static balance.
this would be sooo soo much better when dealing with multi-mic/channel instruments such as a snare with bottom and top mic, and over heads and room mics.
This way, different mixes of these mics (which could create very different sounding results - ie new Instrument saves to library) will be stored with the saved Instrument.