Yep, the singing should work for sure...haven't tried it but will give it a go.

When doing sax, trumpet, and other wind instruments, I usually breath out as if I am blowing into the mouthpiece, and when I run out of wind, I either let the key up, let it fade with the sustain pedal, or back off on the volume pedal if the sound has a continuous hold with the sus pedal.

I've also weaned myself away from using a string pad in the left hand (when in style play mode) as, unless the chords are voiced fairly open, it tends to get a little too thick sounding, and not sounding much like strings. I usually put the string pads in the style itself, and I have several donor styles with these great moving string pads/phrases that really sound smooth. I can also revoice them to other sounds like synth, organ, French Horn etc. to create another mood.

Usually the only sounds I now use in the left hand would be acoustic/electric pianos, some appropriate drawbar settings on the tonewheel sim. and the occasional choir and brass sounds.

Of course, all the above depend on the genre and/or style being used.

Ian