robo

Core Audio Disk Too Slow ....???

hello
this is my first post ...ahem ...
i running logic platinum on a G4 duel processor , if I try to play back my seven track audio song i get the error ... CORE AUDIO DISK TOO SLOW OR SYSTEM OVERLOAD ( -10010) I don't have anuthing else running , is it just the internal sound card ? not powerful enough ? I'm a new mac and logic user so eh... help please ....ta
oh yeah ..

Machine Model:Power Mac G4
CPU Type: PowerPC G4 (2.9)
Number Of CPUs: 2
CPU Speed: 500 MHz
L2 Cache (per CPU): 1 MB
Memory: 512 MB
Bus Speed: 100 MHz
Boot ROM Version: 4.28f1

maybe I should mention that when I load this song I get a 'creating overview for ...." each audio track ,this is the small progress bar window on the top left cornor of my arrange window, followed by a
'read/write does not allow writing Result code -61 ' this happens for each audio track in the song.
many thanks
ro