9-5
Mixing & Effects
Second, Pro Audio lets you choose two modes of operation for the stereo
pan/balance controls:
Third, Pro Audio offers two tapering options for how MIDI volume and
velocity are combined to produce actual gain values. With either option,
the actual effective gain on an audio track is the product of two gain
contributions. One contribution comes from the track volume. The other
comes from the event velocity and track velocity offset.
The track volume gain contribution is the same regardless of the taper. If
the MIDI volume is m, then the gain contribution gVolume is as follows:
gVolume = (m ^ 2)/(127 ^ 2)
The velocity contribution depends on the taper you've chosen. If the sum
of the event velocity and the track velocity offset is v, then the velocity
contribution gVelocity is as follows:
Mode... What it means...
Balance Constant audio is not maintained as the signal is swept
across the stereo field. As the balance control is moved
toward the left channel, for example, the volume of the
right channel is gradually reduced to zero, while the left
channel volume is left unchanged.
Pan (Constant Power) Constant audio is maintained as the signal is swept
across the stereo field. As the pan control is moved,
both the right and left channel volumes are changed to
ensure that the total power delivered to the two
channels remains constant.
Tapering option… Velocity contribution…
Linear gVelocity = (v - 103) * 0.75
(approximate)
Quadratic gVelocity = (v ^ 2) / ((127 ^ 2) / 4)
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