Hi Michael,
I tend to forget that all gm sound sources don't all have the brush kit.

Getting a Handclap instead of a brush slap, or a snare drum instead of brush swirl isn't ideal.

Might play around a bit ,and see if maybe one of the other instruments in the gm kit may be a better substitute for those brush sounds than the default handclaps & snare drums.

I'll get back to you.

best wishes
Rikki