3-3
Algorithms and Parameters
PCM 91
Size acts as a master control for the
apparent size of the space being
created. Both Spread and Reverb Time
vary linearly with the setting of Size.
Thus maximum reverb time and spread
require high settings of Size. To find an
appropriate reverb sound, start with a
preset with a similar sound to what you
want to end up with, turn ADJUST to see
what effect it has, then investigate the
parameters, starting with Size. Until you
are familiar with the PCM 91, we
recommend that you edit any patch
driving a parameter rather than editing
the parameter directly.
Once a size has been selected, Spread
and Shape are used to adjust the shape
and duration of the initial reverb
envelope, which together provide the
major sonic impression of room size.
When Shape is at minimum, the
reverberation envelope builds up very
quickly to a maximum amplitude, and
then dies away quickly at a smooth rate.
This envelope is characteristic of small
reverberation chambers and plates.
There are few (if any) size cues in this
envelope, so it is ineffective in creating
ambience. With this Shape setting,
Spread has no effect. The density is set
by the Size control, and the rate of
decay is set by the reverb time controls.
2 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7
3 3.0 3.1 3.2
4 4.0 4.1 4.2
5 5.0 5.1 5.2 5.3 5.4
0 0.0 0.1 0.2 0.3
1.51 1.0 1.1 1.2 1.3 1.4
Controls Mix
5.5 5.6 5.7 5.8
In Lvl RvbOutLvl Out Width
Time Low Rt Mid Rt Crossover Rt HC Pre Delay
Design Size Diffusion Shape Spread Spin
Shelf
Wander Link High Cut
Reflect *Mstr Dly/Lvl *Dly/Lvl L *Dly/Lvl R
Delay *Master *Dly/Lvl/Fbk L *Dly/Lvl/Fbk R
Modulation *Mod:LFO1 *Mod:LFO2 *Mod:AR Env *Mod:Follow *Mod:Latch *Mod:SW1 *Mod:SW2 *Mod:Delay *Mod:S&Hold
Patch Patch 0 Patch 1 Patch 2 Patch 3 Patch 4 Patch 5 Patch 6 Patch 7 Patch 8 Patch 9
Custom *ADJUST *Control 1 *Control 2 KeyWord 2 KeyWord 3 KeyWord 4*Control 3 *Control 4 KeyWord 1
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