Hi Linda,
If you set the global midi channel of the voice live in utilities>Voice live, the app will automatically change any static song midi messages when it gets sent too the device. Don't worry about the midi channel in the shorthand code.
I can't reproduce the shorthand option issue you see for the harmony scale. I've attached what I see. Are we talking about the same menu?
If you send multiple voicelice settings, here's the order:
Song must go first (since a song will have it's own tempo, key, etc).
Then send the new key
Then send the new harmony scale if required.
If they aren't working properly, try increasing the midi send delay higher than 100ms
Let me know if this helps, or if you need more info, etc
Gareth