Dave Smith Instruments PROPHET 12 DESKTOP - Manual (Page 39)

27 Prophet 12 Module Operation Manual Delay
Reverb and Modulation-Based Effects
A reverb is effectively multiple delays of a source signal as it moves through a
space and bounces off of various surfaces. Convincing small to medium sized
rooms, spring, and plate reverb effects can be simulated using the four delay
paths, feedback paths, and amounts. Try setting each of the delay times to differ-
ent time settings between 30 and 70. Set the amounts and feedbacks to different
values and listen to how the sound changes. Altering the values of the above
parameters will “sculpt” the sound of the reverberation.
The delay time can be modulated to produce flanging and chorus effects. The
main difference between the two is that flanging uses feedback and chorus does
not, and chorus typically uses a longer delay time (though, with modulation, the
range of delay times for each effect may actually overlap a bit).
For flanging, a Time value of 31 (4.8157 milliseconds) or less is a good place to
start. Use a triangle wave LFO to modulate the delay time, being careful to keep
the LFO Amount low so that it doesn’t drive the delay time to zero and “flatten
out” the triangle at one extreme. It will be fairly obvious when that happens.
For chorus, start with a value around 53 (17.164 milliseconds).
For ping-pong effects, use a square LFO routed to Delay Pan. The Delay Pan
parameter sets the initial pan position. Both the LFO and the Delay must have
Sync on, and the LFO should also have Wave Reset on, to keep everything in
sync.