ALLEN & HEATH XONE 464, Руководство пользователя

Страница: 26 / 37

26 XONE:464 User Guide
VCF Filters
The XONE:464 is unique in being the first DJ mixer to include an analogue
voltage controlled filter (VCF) section. These filters provide live performance
tools far more powerful than any equaliser or kill switch. They produce the
same warm analog resonant frequency sweeping sound as made popular by
well known classic analogue synthesisers, but using the latest high performance
technology for quiet, stable operation.
A voltage controlled filter is an audio filter whose cut-off frequency is altered
by a DC control voltage rather than a variable resistor. This produces a much
wider operating range and more control of the filter response to create unlimited
combinations of effect.
Each X and Y side of the crossfader is provided with its own stereo VCF. Each
can be switched in or out, and each has its own frequency sweep control. The
filter type and resonance effect are globally selected affecting both filters
simultaneously.
RESONANCE Adjust this to change the ‘Q’ or ‘sharpness’ of the filters. This
affects how they respond around the cut-off frequency. At the minimum MILD
setting the filters have a gentle roll-off ‘knee’ giving a subtle, smooth response.
At the clockwise WILD setting they produce a resonant feedback boost around
cut-off resulting in some very dramatic performance effects. The sound varies
according to the filter type selected. To avoid unexpected results it is best to
start experimenting with RESONANCE set to a low position.
High RESONANCE settings result in significant boost of selected
frequencies. Reduce the channel GAIN if the signal levels increase
enough to light the red PK leds in the output meters. Failure to do this
may result in system overload and distortion.
FILTER ON Each X and Y filter has its own ON switch. The blue led lights
when the filter is switched on. The signal is not affected by the filter if the switch
is in its off position. Use this to punch the filter effect in or out.
VCF SWEEP Each X and Y filter has its own frequency sweep control to
adjust the cut-off point anywhere from low to high frequency. Rotating the
control during performance produces the dynamic sweeping effects desired by
performing DJs. These large controls are positioned either side of the
crossfader for convenient live operation. Separate controls for X and Y mean
that the effect can be applied to each track independently and faded in as the
crossfader is operated.