I have an XP-30. I am now using a Mac with Logic Audio Platinum 4.5. I used to have a PC with the same program and the same thing has been occurring. I am able to play Midi Channels 1, 2, 3, & 10. The others will not play. Everything is turned on in Logic. I have changed Midi Interfaces. I am now using a Roland MPU-64. I was using a MOTU Midi Express XT and the same thing has been happening. I tried different Midi Cables. I have also gotten a NEW XP-30. Same thing happens. Can anyone steer me into the right direction of what else to try? Has anyone had anything like this before? Any settings I should change in the keyboard? Please Resond ASAP! Any help is greatly appreciated!