Dave Smith Instruments PROPHET 12 KEYBOARD - Manual (Page 36)

26 Delay Dave Smith Instruments
Note: The maximum delay time is 1 second. The combination of
longer synced delay times with slower tempos can result in delay
times that would be greater than 1 second. When that happens, the
delay time is divided by 2 until it no longer exceeds the 1 second
limit. For example, if the BPM is set to 60 and Delay Time is set to
Half, the expected delay time would be 2 seconds. The actual delay
time will be 1 second (2 seconds divided by 2).
Amount: 0...127 —Sets the level of the delayed signal. When set to 0, the
delay is essentially off.
Feedback: 0...127 —Sets the amount of feedback from the selected delay
tap to the input of the delay.
Delay Pan —Delay Pan is not a parameter in the Delay section, but it is
worth mentioning here. Delay Pan is a modulation destination. That is,
the stereo pan position of the delayed signal can be modulated using an
LFO or any mod source in the modulation matrix.
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 different 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.