How does it do if the MIDI (Rodgers) is already on before starting HW?
I leave my HW system computer sleeping all the time and follow the following sequence religiously:
1. MIDI on
2. Audio interface on
3. Wake computer (wait for audio interface to indicate proper frequency)
4. Speakers on (powered monitors/subs)
And when it's time to shut the organ down the same steps are followed in reverse order with #3 being "Put computer to sleep".
Never any problems.