Possibly related bug: No sound on rdesktop 1.6.0 connecting to Windows _XP_ 64-bit.
Turning on -r disk:tmp=/tmp didn't fix sound.
At least in my case, the sound drivers on the Windows box did get set to Microsoft RDP Audio Driver, so it seems to be a client-side issue.
Possibly related bug: No sound on rdesktop 1.6.0 connecting to Windows _XP_ 64-bit.
Turning on -r disk:tmp=/tmp didn't fix sound.
At least in my case, the sound drivers on the Windows box did get set to Microsoft RDP Audio Driver, so it seems to be a client-side issue.