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The OUTPUT LEVEL control should be used to make any changes to the overall amplifier
volume whilst the INPUT GAIN control is left set at its optimum position to suit your
instrument.
To set these two controls correctly use the following procedure: -
First turn the OUTPUT LEVEL control to zero.
Plug your bass into the appropriate ACTIVE or PASSIVE input.
Turn all volume controls on your bass up full.
Gradually turn up the INPUT GAIN control while playing your bass as hard as you are
likely to during your performance.
When the red LESS GAIN LED lights up reduce the INPUT GAIN slightly until this LED
goes out.
Now turn up the OUTPUT LEVEL to give the desired volume.
N.B. For most instruments the INPUT GAIN control will end up being set between 6 and
9 on the scale.
If the GRAPHIC EQUALISATION is altered it may be necessary to re-adjust the
INPUT GAIN control. All circuits in the pre-amp are designed to work at their optimum
when the INPUT GAIN is correctly set.
Playing PASSIVE basses with the instruments own volume control turned back
will reduce the upper frequency response of the instrument, so try to keep this control
well advanced, using the amplifiers OUTPUT LEVEL control to provide for larger changes
in volume.
Mid Pre Shape
The MID PRE SHAPE facility is like a preset graphic equaliser built into the unit that you
can switch in or out to modify the sound of the bass.
This will add extra punch to your sound and may be used with or without the graphic
equalisation section being switched in.
The MID PRE SHAPE may be switched IN and OUT with the MID PRE SHAPE push
button switch on the front panel.
Graphic Equalisation
A GRAPHIC EQUALISER is a very flexible way of altering the sound of a bass guitar, and
if properly used will provide an extremely powerful method of tone shaping for your
instrument.
The GP7 graphic equaliser has been specially designed for the tone shaping of a bass,
and is more powerful and very different to the kind of graphic equaliser found for
instance on a Hi-Fi. Because of this there are a few rules to observe in its use.
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