Audio issues. Static burst when listening to MP3s. ETA on fix.

Hi,
I am using a Line 6 Toneport. It is essentially a USB sound card.
Somewhere between 10.4.9 and updated to the latest, 10.4.11, I now hear static bursts when multitasking.
I assumed this was a driver issue with the Line 6 device so I decided to use the built in audio output and noticed a similar issue. Light multitasking will cause static bursts or droup-outs depending on what I am doing. Even something like checking email or launching word while listening to an MP3. This was never the case before.
Steps I tried.
1. Uninstalled and reinstalled latest Toneport drivers. no difference
2. Formatted and reinstalled Tiger 10.4.9 got all the updates and installed latest drives for the Toneport. Slight improvement
3. Upgraded from 1GB to 4 GB of RAM (I was going to do this anyway) no change
4. Upgraded to solid state harddrive (I was going to do this anyway) no change
5. Formatted then installed Leopard, all the updates, and latest Tone Port drivers. Problem solved.
New Problem. Everything runs like crap on Leopard compared to tiger. Any ETA on a Tiger Update?
PS can somebody please explain the benefit or Leopard? Don't even tell me Time Machine. Seriously, has anybody done any benchmarking on this system compared to Tiger. It is a complete pig and slow as ****.

Hi.
PS can somebody please explain the benefit or Leopard?
No advantage to me. I equate OSX to a TV Remote, but in Leopard you give to somebody else for exclusive use.
I doubt Tiger will get anything but maybe some Security updates.

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