Volume knob not controlling the volume

Volume knob not controlling the volume
« on: July 02, 2024, 08:07:12 PM »
Hi fellow Prophet folks. I have a Prophet 10 rev4 that's been wonderful the last couple years. I encountered my first head scratcher today.

My DAW is Logic Pro 11.0.1.

The Prophet 10 rev4 is connected via unbalanced, newish Fender guitar cable to the second XLR/line in on a U-Phoria UMC404HD Audio interface.

I noticed today there is nearly 0 impact of the volume knob on the level detected by Logic Pro and heard through my monitor speakers  :o

For example, I currently have the volume knob turned all the way down, and I have a perfectly good audio signal in my DAW. If I turn the volume up, I hear a bit of crackling while turning the knob, but no difference at all in the volume once I have dialed "past" the crackling. Everything sounds identical at a volume of 0 or 10.

The gain is turned all the way down on the U-Phoria channel, and the selector switch is set to LINE. The PAD switch is turned off.

Prophet 10 local control is On.

Is there a mode of operation that would account for the volume knob doing ~nothing while everything else seems to be working perfectly?

Re: Volume knob not controlling the volume
« Reply #1 on: July 02, 2024, 08:22:43 PM »
I have noticed that when I stop trying to control the Prophet 10 rev4 with my SL88 Grand controller, the volume knob works normally--strongly suggesting to me that the issue is MIDI volume setting over-riding local control. Not sure if that's a good explanation, but seems rational to me.

Re: Volume knob not controlling the volume
« Reply #2 on: July 02, 2024, 08:27:26 PM »
Do you have a pedal connected into the volume input? Once i forgot i had one plugged into the cutoff and got confused.

But also, yeah maybe a device sending on CC7? A patch editor?
« Last Edit: July 02, 2024, 08:29:15 PM by johnsimmons »

Re: Volume knob not controlling the volume
« Reply #3 on: July 02, 2024, 08:32:10 PM »
Thanks. Great question. I have a continuous mode damper pedal plugged into the SL88 Grand. But it's assigned to be a sustain pedal.

Qwave

Re: Volume knob not controlling the volume
« Reply #4 on: July 12, 2024, 02:24:32 AM »
The Volume knob is working fine here. No MIDI connected. No pedal either.
keep on turning these knobs