Thanks-- glad to be here!, I love the QY's,?
I figured it out- the patterns I was using for my latest song on the QY100 were preset patterns --ie BritPop, which you can't change - delete phrases etc. and when you try muting them they don't stay that way in song mode
however if you copy the patterns (in Jobs) as user patterns - or even just create you own user patterns, you are able to mute/solo the track patterns and they stay like that in song mode.
Now the decision becomes do I part with my beloved QY700 and have the 100 as my main sequencer - song creator. The screen on the 700 is killer..plus the buttons are great - 2 reason to keep it.