Section 2 — Algorithms
ENSONIQ DP/4+ Reference Manual 45
GUITAR AMP 1, GUITAR AMP 2
These algorithms recreate the warm sound of a tube guitar amplifier. They do this by emulating
tube distortion characteristics. These algorithms are good for all stringed instruments. Guitar
Amp 1 offers more distortion than Guitar Amp 2.
Guitar Amp 1 is designed for Hard Rock sounds.
Guitar Amp 2 is optimized for “bluesy” type sounds.
01 — Mix
02 — Volume
See the descriptions under the Mix and Volume Parameters, in the beginning of this section.
03 — Amp Preamp Gain Range: -48 to +48 dB
Adjusts the amount of boost or cut applied to the incoming signal. We recommend a setting of 00
dB, since these emulations were optimized for distortion there. Lower preamp gains will result
in less distortion, while higher preamp gains will yield clipping distortion. For low preamp gain,
it may be desirable to use low tube bias values.
04 — Output Level Range: 00 to 99
This parameter controls the output level of the main amp before the output EQ.
05 — Amp Tube Bias Range: 00 to 99
For preamp gains approximately 00 dB, this parameter controls the emphasis of even to odd
harmonics which determines the tone of the amp; mid values emphasize even harmonics and
offer a warmer (“glowing tube”) sound, while the highest values may sound like tubes going
bad. Tube bias and preamp gain are independent parameters. For low preamp gain, it may be
desirable to use low tube bias values, because this more closely imitates the operation of a real
amplifier.
06 — Pre-EQ Input Level Trim Range: -24 to +00 dB
Controls the input level to the pre-amp EQ to eliminate the possibility of clipping boosted
signals.
07 — Pre-EQ High Pass Cutoff Range: 4 to 1000 Hz
Filters out the low frequencies before the preamp. The higher the value, the less low frequencies
pass through.
08 — Pre-EQ Fc Range: 100 to 9999 Hz
This parameter determines the center frequency of the parametric filter before the preamp.
Higher values have a brighter sound.
09 — Pre-EQ Gain Range: -48 to +24 dB
Adjusts the amount of boost or cut applied to the parametric filter in front of the preamp.
10 — Pre-EQ Q Range: 01 to 18
Determines the width of the resonant peak at the parametric filter center frequency. While the
Filter center parameter determines where (at what frequency) this peak will occur, the Q setting
controls the presence of the peak.
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