Analogue Solutions 4Voice, Руководство пользователя

Страница: 19 / 33

analogue solutions
Semblance/4Voice V2
e&oe (c) 21-10-2004
19
envelope level is in turn controlled by CV2 (MIDI). This allows velocity/controller dynam-
ics to change the volume. If CV2 source is MIDI volume (controller 7) then MIDI volume
changes can be realised.
GATE
When GATE is selected, the MIDI note on/off information is used to modulate the
VCA. With this, the VCA level is either off or full on. The audio envelope would be like an
organ's, with no attack or decay time.
ON
When ON is selected, the VCA is left permanently on at full level. Use this setting if
you wish to use the Filter as an effects processor, to process external audio fed into Sem-
blance via the EXT1 socket.
VOLUME
This sets the output volume of Semblance, i.e. the output level from the VCA that is
sent to the SIGNAL output socket.
On the 4Voice, the main output is fed directly at 1:1 level into the Master mixer. Level
adjustment of each four voices must be made using this volume control. The master mixer
has a main output level separately that controls the level of all 4 voices together (i.e. the
mixed signal).
LFO / Sample and Hold
The Low Frequency Oscillator (LFO) is basically identi-
cal to a VCO; it is another oscillator, except that it produces
periodic wave forms of low frequency, typically sub-audio.
These slow cyclic waveforms are used for modulating other
circuit parameters, for example, for sweeping the fi lter cut-off
up and down, either slowly for a nice sweep, or faster for a
'wah-wah' type effect. It could be used to modulate the VCO
pitch for vibrato.
The LFO block is grouped together with the VCOs as
an LFO is an oscillator just like the VCOs are.
SPEED
This sets the frequency (speed) of the LFO.
SPEED LED indicator
This wil turn on each time the LFO signal is at a positive voltage, indicating the speed
of the LFO waveform.