cubasis + tascam us-122 problems - heelp!?!

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Hi there

I have just bought a tascam us-122 and I'm trying to use the free Cubasis software - it's driving me nuts!!!

I've installed the drivers, oms, and cubasis on my imac (os 9.2) - but I can't get anything decent in the way of sound out of the thing.

Cubasis registers the notes I've played on the keyboard - and I can hear it when I switch the us-122 to direct monitor - but I have to have all the volume controls on full.

I've tried the demo song and that plays okay - at a good volume.

I've checked the sounds control panels. ie. control panels > sounds
output = us-122
input = us-122 - but here there is a box which says "settings for input device and source" - then a box saying "play sound through output device" - if I check this box, it immediately unchecks itself (!!?!!) - so I cannot choose to have the output audio played through the device (ie. the us-122).

If anyone has any ideas what I can do, I'd really appreciate some help - the place where I bought the us-122 don't know anything about using it with a mac - I've spent 3 days on this - plus Cubasis keeps crashing (it disappears from the screen saying either "error type 1 - or type 3 - or type 84 has occured").

Does anyone know of a decent/easier/free software program to use with us-122 on imac os 9.1?

Sorry it's such a huge post - hope someone can help.

cheers

j.