Pixie Attaché
– an EDP WASP clone
ELBY Designs
– Laurie Biddulph
Kariong, NSW 2250, Australia
10 of 18
In addition to modulating the frequencies
of DCO 1 and DCO 2, the LFO can be
used to sweep the frequency of the filters
VCF 1 and VCF 2. The amount of
modulation is determined by the [LFO]
control (15). If this knob is set in the mid
position it has no effect. Rotating it
clockwise will increase the amount of
modulation, the shape and speed being
determined by controls (17) and (18).
Rotating it anti-clockwise gives a similar
effect but the modulation wave shape is
inverted.
ACTION:
(1) set up as shown in Figure 1, with DCO 1 and DCO 2 in unison on '0' (4), and the [DCO 2]
control (37) turned up.
(2)
(3) Hold middle C and rotate the [LFO] control (15) clockwise and then anti-clockwise. When
it is clockwise (positive modulation) the filter will be swept by a rising sawtooth as shown.
Turning it anti-clockwise alters the sweep wave shape to a falling sawtooth. Figure 11
makes these clearer. Note that for full modulation the [RATE] control (17) has to be set
so that the LFO can cover the full frequency range of the filter.