I have never been able to find it online but, you can get the 3000xl off the Akai website, the basic functions are just about the same. I have a s3000i and I think the only difference between them and a S3000 (without 'i') is they have the internal scsi card and space for an additional drive inside.
The 3000xl manual is probably the closest you'll find and pretty much covers everything.
P.s if you just want to play at the same pitch you you recorded it at set it to 'constant[' in the program parameters. S3000i's are dope. Full 8 outputs and a built in effects unit. Also internal Scsi and space for another !