Hopefully someone can help me out.
I have a slim attached to an audio interface and controlled by an Roland FA-08. I hear everything just fine with our without the computer on.
However, if I connect the Slim’s USB into the back of the computer, for some reason the sounds just stops coming out of the Slim UNLESS the computer is actually on. As soon as I unplug the USB, sound will work fine with out the computer. This makes no sense to me. Is this some type of setting in the Slim?
Anyone?
Look at pages 31 and 32 of the manual for the menu setting for MIDI in. I suspect that with it set to USB/DIN and cables connected to both MIDI inputs, It only responds to the USB inputs, not both.
I looked at those, but there is an oddity.
If the computer is off, and the USB is plugged in, those two options (Midi In and Midi Out) do not even show up in the menu! I think that is strange. As soon as I unplug the USB, those options show up immediately. I would assume the MIdi in should be set to Din, but I can’t find any options that will actually make it sound if the USB is in and the computer is off.
I really don’t understand this.
Another data point:
If I uplug the USB to make it sound, then plug the USB back in, it still sounds.
I do think you are on the right track. With the USB plugged in, my interface meter shows now output - so it is like the Phatty is just not processing the incoming Midi
Does anyone have any idea on this?