Did you ever get the sound module to work? I've used them at 2400 baud (BR1 and BR0 low) without too many problems. It is important to check the that the module isn't busy (pin 3 on the module isn't low) before sending commands e.g:

loop:
if busy=0 then loop 'check module

SEROUT RXD,0,[$FC,62] 'set volume
SEROUT RXD,0,[0] 'play file

Also, are you sending data to pin 2 of of the module, as this is the module transmit pin and not the receive pin?

It is also a good idea to set the volume, as I have played files with no O/P only to find that the volume was set too low!

The only problem that I have with the module is that they draw 10mA when not in use and when I put in sleep mode (Of8h) I can't wake it up again!