Section 2 — Algorithms
ENSONIQ DP/4+ Reference Manual 47
GUITAR AMP 3
Guitar Amp 3 combines an inverse expander with a bright distortion for amp lead sounds. The
inverse expander may be thought of as a compressor that amplifies all signals below the
threshold. This algorithm is good for heavy metal and hard rock guitar solos.
01 — Mix
02 — Volume
See the descriptions under the Mix and Volume Parameters, in the beginning of this section.
03 — Preamp Gain Range: -48 to +48 dB
Adjusts the amount of boost or cut applied to the EQ’d incoming signal. Lead sounds are
obtained using high gain.
04 — Output Level Range: 00 to 99
This parameter controls the output level before the output EQ.
05 — PreEQ Input Level Trim Range: -24 to +00 dB
Controls the input level to the preamp EQ to eliminate the possibility of clipping boosted signals.
06 — Pre-EQ Fc Range: 100 to 9999 Hz
Determines the filter center frequency of the parametric in the preamp stage. Higher values have
a brighter sound.
07 — Pre-EQ Gain Range: -48 to +24 dB
This parameter adjusts the amount of boost or cut applied to the preamp parametric.
08 — Pre-EQ Q Range: 01 to 18
Determines the width of the resonant peak at the filter center. While the Filter center parameter
determines where (at what frequency) this peak will occur, the Q setting controls the presence of
the peak.
09 — ExpndRatio Range: 1:1 to 40:1, infinity
Sets the amount of inverse expansion. Expansion occurs below the threshold. If this is set to 3:1
for example, it will expand the change in signals below the threshold by three times in an attempt
to make the signal amplitude approach the threshold level.
10 — Threshold Range: -96 to +00 dB
Sets the inverse expander threshold level. Signals beneath this level will be expanded, while
signals that are above will be unaffected. As the input signal dies away below the threshold, the
expander will increase the gain of the signal.
11 — Gain Change Range: N/A
This read only parameter shows the level of the signal.
12 — Noise Gate Off Below Range: -96 to +00 dB
Sets the lower threshold level at which the noise gate shuts off the audio.