Hello Pete,
Welcome back. I can see you are busy answering many questions.
I use ProSim737 (and highly recomend it), FS9, five PCs with various PFD/ND/ENG displays, hardware (SIOC, IOcards, WideClient), instructor station etc. I use one of the PC's sound output (on the ENG/SYS computer) for ProSim Audio (warnings/traffic) through two speakers above the pilots heads. This works great. But - If I run the RAAS on the same separate computer (having copied the output of MakeRunways r4.csv to it [and with Wideclient running]) RAAS does not make any sound but ProSim audio continues nicely. I have tried disabling Prosim Audio first and re-running but RASS remains silent throughout any flight. However, RAAS does report back to FS9 from the second computer with a text report at the end of the flight?
I'll keep trying to contact the RAAS author.
Cheers,
Aussie123