were u upping the ram alotted to the program?
what exactly is the problem again? u say its unusable..... u say Cubase just doesn't seem to be happy..
what exactly is happening?
u didnt even tell us which powermac u have?
ok i see now your sig..
-G4 MDD 1.25GHz (Single 2003) with 2x 80Gb harddrives, 1Gb RAM, Tascam US-428 and Edirol FA-101
-eMac 1.25GHz with 2Gb RAM with OSX Tiger/Leopard-iMac G3 DV 400MHz
-Intel Core2 Duo machine with 4Gb on WindowsXP/Windows7 dual boot OS.
u are trying with both interfaces? usb tascam? and firewire edirol fa-101? why not just try with one to test + make sure the problem doesnt stem from using both usb + firewire drivers at the same time?
are u sure the problem you are having isnt due to ASIO driver? what are the symptoms ?