How do you Solo an instrument in Mixer?

[Tommarr]

I see that you can Mute an instrument via Mixer during Song playback.
How do you do the "opposite" and Solo an instrument?

Thanks!!

[ton37]

Just press the solo-wanted instrument a little longer and 'voila'  Then it colours to 'purple' (solo). After that a short touch and all is green again (All). Only in the <Style> and <Song> tabs!