@millercarbon,
I have an ongoing thread since I bought the Rock 7. Been so long since I posted to it, can’t remember the title.
Anyway, I’d been disappointed with the Merlin DC power supply. I believe it’s another version that converts AC to DC then back to AC. The motor is an AC unit. Anyway it always ran fast.
If I can get this package set up correctly, I’ll have more control over pitch/speed than just moving the motor.