It's treated as 5.1 + 2 aux channels. This allows AL_DIRECT_CHANNELS_SOFT to
behave better, not forwarding rear left/right channel inputs to lower front and
upper rear, and allows reporting a more appropriate output mode to the app
instead of 7.1.
This one is a regular layout first-order dual-band decoder, which excludes the
front-center (to maintain regularity). The previous was a second-order single-
band decoder, which included front-center.
The itu5.1-nocenter preset is the same as the previous default, so it can still
be used for people that prefer it. But this new one purportedly has better
panning and positioning responses in listening tests, which initial impressions
concur with.
AL_LOKI_quadriphonic is left alone since that is what the extension is called
and what code expects. All other instances have been fixed for consistency.
On some speaker setups, the front-center speaker is not designed for full-range
content and should be used exclusively for dialog. Consequently it should not
be used for positional sounds, only the dedicated dialog effect.
Chris Robinson