ISP Technologies THETA PRE AMP - Manual (Page 8)

6. TREBLE CONTROL
The TREBLE control adjusts the boost or cut that is applied in the high frequency portion
of the spectrum of DISTORTION CHANNEL. The maximum TREBLE boost and cut range
is +/-15 decibels.
7. REVERB LEVEL CONTROL
The REVERB control adjusts the amount of digital reverb that is added when using the
DISTORTION channel. The digital REVERB in the COMBO amplifier has a bandwidth of
18KHz and also includes a digital implementation of the Decimator noise reduction to
ensure that the digital reverb has a dynamic range greater than 110db.
8. DECIMATOR NOISE REDUCTION
The DISTORTION channel DECIMATOR control adjusts the threshold of the CLEAN
channel noise reduction. The DECIMATOR noise reduction is a down low level
downward expander incorporating ISP’s patent pending TIME VECTOR PROCESSING.
Setting the Decimator Noise Reduction System:
Setting the Decimator Threshold for proper use with the Distortion channel is easy if you
follow these instructions. Set the Decimator Threshold full counterclockwise. Adjust the
Distortion gain and Preamp2 gain as desired for your playing. Slowly increase the
Decimator Threshold until the background noise just disappears. This will be the best
possible setting for the Decimator. Increasing the Threshold beyond this point will cause
expansion to be more aggressive than desirable. Some experimentation may be required
to get the best possible Threshold setting.
9. LEVEL CONTROL
The LEVEL control adjusts the output level of the DISTORTION channel. NOTE: The final
output level is determined by the setting of the DISTORTION LEVEL and the MASTER
LEVEL CONTROL.
THETA MASTER CONTROLS
1. LEVEL / MASTER OUTPUT LEVEL
This control determines the master output LEVEL of the THETA
guitar preamplifier.
2. EFFECTS LEVEL CONTROL
This control adjusts the level of an externally connected effects
processor. NOTE: The loop must be turned on via the FOOT
CONTROLLER in order for the EFFECTS level to operate.
3. SOLO LEVEL
This control adjusts the amount of boost that will be applied to the output signal when the
FOOT CONTROLLER boost switch is activated. This control allows the user to switch on and
off via the FOOT CONTROLLER up to 6db of output level boost if desired for soloing
4. DECIMATOR IN/OUT SWITCH
This master DECIMATOR IN / OUT switch activates both the CLEAN channel and
DISTORTION channel DECIMATOR noise reduction systems.