SoundCraft GIGRAC User Manual page 12

3. Adding Treble or Bass to the signal
The GigRac offers simple Treble and Bass control for changing the tone
of the signal.
Treble (5)
To add or remove some brightness or 'sparkle' to or from a signal, use
the Treble control. In the center 'click' position (0) the Treble control
has no effect. Turning it clockwise will boost the treble frequencies
making the signal sound brighter. Turning it anti-clockwise will have the
opposite effect by removing the treble frequencies and making the signal
sound less bright.
The Treble control is handy for adding some sparkle for example to an
acoustic guitar, or for reducing the 's' sound from sibilant vocals.
Bass (6)
To add some 'bass thump' to a signal or remove some 'boominess' or
rumble, use the Bass control. In the center 'click' position (0) the Bass
control has no effect. Turning it clockwise will boost the Bass frequencies
making the signal sound punchier and more 'bassy'. Turning it anti-
clockwise will have the opposite effect by removing the bass frequencies
and making the signal sound less 'boomy'.
The Bass control is useful for making a bass drum sound punchier, or
alternatively could be used for reducing explosive 'b' and 'p' sounds from
a vocal signal.
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