I just purchased a used Roland RD-500 and the first time I used it as a midi controller through my presonus firestudio mobile with garageband it worked fine and I was able to record a track. Later on I went to try and for the life of me I cannot get it to work. I downloaded the manual and read that the channel settings must match that of the firestudio but I do not know what those are. The manual for the firestudio does not specify this. I tried fiddling with the 16 channels on the RD-500 in various setting but to know avail. I also reset the keyboard to manufacturers setting since I had played with the setting so much and wanted to make sure I had not goofed it up.

Any advice here?