Apple Soundtrack Pro 2 - Manual (Page 302)

302 Chapter 9 Mixing Surround Sound
 Collapse: Typically, panners are either of a collapsing style (panning folds input
signals into output speakers) or an attenuating style (panning simply turns down the
gain of speakers further from the pan location). The Collapse slider goes from a fully
attenuating style, through a hybrid style, to a fully collapsing style. At full attenuate
(0% on the slider), no input bleeds to any other output; each channel remains at its
original speaker position. The only change is to output gain. At full collapse (100% on
the slider), no input gain is changed—instead, inputs have their output divided over
adjacent channels. At 50%, a given input channel panned away has its input
attenuated by 50% and distributed between the two adjacent channels.
 Center Bias: Use this slider to determine how the center channel interacts with the
left and right channels. At 0%, all sound that would have gone to the center speaker
is equally distributed to the left and right speaker. At 100%, the center is used fully,
just like any other speaker. This means that if you move the puck directly in front of
the center speaker, all sound emanates exclusively from that speaker. If you move the
puck halfway between the center channel and an adjacent channel (yet still on the
perimeter of the black circle), the sound is equally and exclusively divided between
those two speakers.
 LFE Balance: Use this slider to balance control between LFE and the other five
channels. At -100, nothing is output from the LFE speaker, even if there was LFE input,
and all other channels pass through at unity gain. At its midpoint (0), all six channels
passes through at unity gain to their respective speakers, meaning that LFE input
passes directly to LFE output. At +100, all six signals get summed to the LFE speaker.
Collapse at 0 Collapse at 95 Collapse at 50