Logic express 7.2.1 with Tascam US-122 issue

Im running Mac OS X 10.4.7 on a Powerbook 1.67 Ghz PowerPC G4 with 512 in RAM. My software is Logic Express 7.2.1.
I've installed the latest drivers to my USB external audio device Tascam US-122: 3.4.0 found on Tascam's website.
Here is the problem: I need to use sample rates (I/O buffer size) 512 or 1024 otherwise it starts to "crackle" and telling "system overload". With my new latop it should run on 64 or even 32.
- Any help what the problem is?
I have tried both re-installing logic express and us-122 drivers.

Hi Niili,
I have the same problem with a digi drivers too,
I didn't have a clue on how to to deal with iet,
you wanna laght?
When I use Protools Le, I can have lower buffers without problem,
not with logic!
It problably have to do with the drivers.
I'll get back to you, if I have better news.
I'll hope the you do the same if you discover a turn around it.
Or any mates out here!
:o)
Kindly regards,
Jorge

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