I'm tinkering with using an aux send on my instrument, and it's working pretty well.
I would think that since the routing is split to 2 places, the aux would be a pre fader send (aka independent of the Simple Gain FX that controls the output of the sampler), but It appears that the send is "post fader".
Is there any way to change that?
Hopefully I'm explaining that correctly.

Ah yes, this is a bit misleading. I mean monophonic in contrary to polyphonic (FLAC and all other codecs have to work with fully mixed and mastered songs, which isn't the case when just using samples).

Yes of course. They are even embedded in a HISE Playe library.

You could also skip the namespace. and write the variable name without prefix. This will work even if there are global variables with the same name.