Regarding the multimedia subsystem, as far as the audio portion goes it would basically be better to start from anew since the OS/2 MM implementation was the first modern MM subsystem and is starting to show its age. In 1999 or 2000 Bob from Serenity systems said that the sourece code for the MM subsystem was available for those that wanted to work on it although it was not possible to open source it, does anyone know if the source was ever made available ?
I vaguely recall sending someone a mail about it at the time and not getting an answer ....