RDC 2 Sound Issue

Morning All.

Quick flick thru the archives shows a handful of people with similar
issues in older versions and no real resolution, however hope someone
may have some suggestions.

Running RDC 2.0.0 on Leopard connecting to a Windows 2003 Std Server,
Sound Redirection has been enabled in both the RDC client and the
terminal services config on the server itself.

I am able to unmute the device within volume control however if I
attempt to turn up the audio then click OK / close volume control the
slider automatically slides back to the bottom. Trying to play an
audio file in WMP prompts that there is an issue with the sound
device.

I am able to remote desktop from a Windows box to the same server and
audio plays fine.

Any suggestion much appreciated, thanks in advance.

Nick.