Digi 003+ Rack and drivers for Yosemite 10.10.3

Please forgive the newbie question. I've just bought a
Digi003+ rack second hand and wanting to use in with Yosemite 10.10.3. The latest drivers are supposed to work with this version:
http://ift.tt/1iu4FX1

There's a signal but it's VERY distorted and quiet.

I've looked over the threads here and people don't seem to think that the 003 will work with Yosemite.

No I don't have a new enough version of Pro Tools yet. Trying to get it to work with other DAWs at the moment.

I'll keep hunting to see whether anyone has got this working on a 10.10.3 or not.

Any clues or wisdom would be helpful.

thanks

Craig