I accidentally purchased a Rocktron 5pin-7pin MIDI cable. Is there any way to actually make this work with the Ultra? I tried plugging the 5 pin end into the GCP and the 7 pin end into the Ultra. I tried plugging the GCP power supply into both the Ultra and the adapter plug on the Rocktron pedal to no avail. Thanks.
Here's the cable.
Here's the cable.