User`s manual

Page 42
Voyager OS User’s Manual - Appendices
Page 43
Voyager OS User’s Manual - Appendices
To produce a modulated  lter effect:
Using a patch cord, make a connection from the CP-251 Attenuator Output jack to the Voyager’s
FILTER jack. On the CP-251, set the LFO
RATE
control to 6 Hz (about 1 o’clock), and adjust the
ATTENUATOR
to about ‘2’ on the dial. This will produce a cyclical tonal variation as the  lter cutoff
frequency is modulated. Setting the CP-251’s LFO
RATE
control considerably higher will result in
wild timbral textures, while a very low setting will create a slowly evolving  lter sweep.
2. Inverting the keyboard CV to the Filters
This is a handy little trick that can be used to lower the  lter cutoff as you play higher on the keyboard. This
effect mimics certain acoustic instruments like a cello, whose tone gets duller as higher notes are played.
- Set the panel controls to the default con guration.
- Turn the Voyager Filter
KB. CONT. AMOUNT
control to ‘0’
- Using a patch cord, connect the VX-351 KBD PITCH output to the CP-251 Attenuator Input.
- With a second patch cord, connect the Attenuator output to the Voyager’s FILTER jack
.
- Set the CP-251’s
ATTENUATOR
control level to -5.
Play a scale up the keyboard, from low to high, and you’ll notice that the sound gets much duller. Adjust the
FILTER CUTOFF
and
ATTENUATOR
controls to taste.
3. Creating Sample and Hold staircase patterns
A Sample and Hold circuit can be used for more than generating random voltages. One type of modulation
pattern that can be achieved is called ‘Staircase’ modulation. It is achieved by feeding a slow triangle wave
into the Sample and Hold circuit and sampling that input at a high rate, effectively chopping the triangle
wave into discreet voltage levels that resembles a staircase. We’ll use two LFO’s for this; a slow one for the
input and a fast one for the trigger.
- Set the panel controls to the default con guration.
- Set the Voyager’s LFO rate to about .4 Hz.
- Using a patch cable, make a connection from the VX-351’s LFO triangle output jack to the
Voyager’s Sample and Hold Input jack (S&H IN).
- Set the CP-251’s LFO
RATE
control to about 6 Hz (about 1 o’ clock on the dial).
- Using another patch cable, make a connection from the CP-251’s LFO square wave output jack to
the Voyager’s Sample and Hold Gate Input jack (S&H GATE).
- Set the Voyager’s LFO
WAVE
control to the S&H position.
- Set the Mod Bus 1 controls as follows:
SOURCE
: LFO
DESTINATION:
PITCH
CONTROLLER
: MOD WHEEL
AMOUNT:
6
Play a note and move the Mod Wheel forward. You should hear the pitch modulated by an ‘up & down’
staircase waveform.