Okay how old is your powerbook.

If it is recent then you want to use ethernet as i have a G4 powerbook 12" and i use ethernet i have never actually tried USB on it

Jemplode works fine for me but i think it needs version2.0 of the player software but i might be wrong.

Just download the Jemplode package for macs from the site and you should be in business assuming you have OSx
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P.Allison fixer of big engines Mk2+Mk2a signed by God / Hacked by the Lord Aberdeen Scotland