The equipment I have is this: Mbox Yamaha MG12/4 mixer Yamaha PSR-172 keyboard Kawai FS-690 keyboard (for midi control) - decent keyboard for being old Maxtor 80GB external Harddrive USB Midisport 2x2 2 pairs of Sony MDR-V150 headphones (one for monitoring through mixer, one for Mbox) M Audio C02 Digital Converter KLH CDR-2000 Cd Player/Recorder Naxa nx-982 microphone Gateway M305 laptop computer w/512 ram, 2.40Ghz processor Art X-11 Midi master controller I am having trouble playing back more than two tracks of audio. Right now I have three audio tracks, along with a midi track recorded; but when I go to play back I keep getting this message. Can anyone help me with solving this issue? Am I doing something wrong? Much Thanks.