I use a similar feature on my Windows (boo hiss) machine. The SBLive card in it can record the mixer output, which is useful if you want to record stuff with effects applied.

I haven't used a sun machine since the Sparc classics at uni, so it's all a bit of a learning curve.
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)