[dbtx]

3D positioning was added to 1.0, described in RP-049 dated 2009-07-23. The parameters' MSB is 61 (0x3D, nice)

It bears some resemblance to OpenAL source parameters which is little surprise as Creative seems to have written it. Some obvious differences:

- sources' positions are sent in azimuth/elevation/distance, i.e. spherical coordinates instead of rectangular

- the positions are always relative to the listener instead of often having a listener that moves around in a stationary 3D world

- the source is now allowed to be both spatialized and stereo with extra parameters for angular distance between the "speakers", the roll angle of the pair, etc.

I located the PDF maybe on Google, maybe by accident more than a few years ago. (I think it was from MIDI.org even then) I had to make an account at MIDI.org in January just to look through the specs, and it was there. Now I can't find a link so I'm afraid it disappeared behind the MMA member paywall. <sigh> Here's to progress.