Audio Routing

Apologies if this has been answered elsewhere, I just cant find it.

My scores have usually 8 instruments.
I have multiple outputs on my PC.
Musescore will only output audio on channels 1 & 2.
Is there a way I can have it route different instruments to different outputs ?
I looked into Aux sends, but there's only 2 of them and they are limited to efxs :(

I'd like it so that say...
Bass - Output 1
Drums - Output 2
Guitar - Output 3
etc....

This possible.

Oh, I use the Linux (4.5) version.
Thanks.