Rocktron VooDu Valve Online User Manual page 18

The LOW GAIN function is only accessible in configurations which display "L-GAIN"
in the configuration title. The preamp stage in these configurations provides four distortion
types, and can also be used for clean tones.
The PARAMETER SELECT control will allow you to access these Low Gain parameters:
TUBE GAIN The TUBE GAIN parameter sets the amount of drive at the input of the
tube stage.
GAIN The GAIN parameter determines the gain value in the distortion stage.
TUBE The TUBE parameter allows you to select between four different tube
distortion types - Hard Clip, Soft Clip, Class A, Class B. The Hard Clip
setting provides the hardest clipping, while the Soft Clip type provides a
softer clipping and the Class A and B types provide the softest clipping.
The Class A setting produces non-symmetrical clipping - therefore
more even harmonics are produced. Conversely, the Class B setting
produces symmetrical clipping. The differences between these types
are most pronounced at moderate gain settings of about 30dB or less,
where Class B produces the least amount of upper harmonics.
BASS LVL The post BASS LEVEL parameter adjusts the amount of low frequency
information at the output of each preset. This parameter is also acces-
sible from the "Post EQ (Expert)" function. (In the Post EQ function,
the center frequency and bandwidth of this EQ section are also adjust-
able.)
MID LVL The post MID LEVEL parameter adjusts the amount of mid frequency
information at the output of each preset. This parameter is also acces-
sible from the "Post EQ (Expert)" function. (In the Post EQ function,
the center frequency and bandwidth of this EQ section are also adjust-
able.)
TREBLE LVL The post TREBLE LEVEL parameter adjusts the amount of high
frequency information at the output of each preset. This parameter is
also accessible from the "Post EQ (Expert)" function. (In the Post EQ
function, the center frequency and bandwidth of this EQ section are also
adjustable.)
PRESENCE LVL The POST PRESENCE LEVEL parameter also adjusts the amount of
high frequency information at the output of each preset. This parameter
is also accessible from the "Post EQ (Expert)" function. (In the Post EQ
function, the center frequency and bandwidth of this EQ section are also
adjustable.)