Impulse width
Impulse width of the “Square” signal
FM Inputs
Frequency modulation input connection jacks:
Key follow (KYBD CV): pre-cabled for the manual setting of the
key follow
Noise (Noise): pre-cabled for the manual setting of the modulation
by the noise
ADSR Env: pre-cabled for the manual setting of the modulation by
ADSR envelope
Sine oscillator 2 (VCO1 sin): pre-cabled for the manual setting of
the modulation by the sine waveform of oscillator 2
Triangle oscillator2: pre-cabled for the manual setting of the
modulation of the impulse width of the square by the oscillator2
triangle (Pulse width modulation _ VCO2 Triangle)
The general tuning of the 3 oscillators is done with the “VCO Initial frequency”
potentiometer by +- one octave per semi-tone.
For fine tuning, set the Fine tune potentiometer to +/- one semi-tone.
Depending on the position of the “Range” selector switch, the range is of +/- 4
octaves. It is also possible to set it to low frequency position (LF for low frequency).
You will no longer hear any sound, but can now use it as LFO source of modulation.
The impulse width applied to the “sawtooth”, “triangle” and “square” waveforms of
oscillators 2 and 3, can be modified with the “pulse width” potentiometer.
Oscillator 1 possesses two audio outputs for the sawtooth and square waveforms. These
can be used simultaneously. The second and third oscillators possess four outputs for the
sawtooth, sine, triangle and square.
The frequency modulation inputs (FM Control) and Pulse Width Modulation allow the
control of these parameters thanks to the outputs of other modules (an envelope, a LFO
for example) They are all pre-cabled to a defined module in advance by the developer of
the ARP 2600V2. This is to simplify the use of the synthesizer. For example: the
frequency of oscillator 1 can be modulated, from the left to the right, by the key follow,
the sample and hold, the ADSR envelope and the oscillator 2 sine. In low frequency
position (LF), the oscillators perform modulation using the lower CPU power compared to
the other positions.
To set the modulation rate, use the linear potentiometer situated above the
corresponding jack.
You can also connect another source of modulation to each input. This considerably
widens the possibilities for sound creation.
For a conventional key follow setting (in relation to the scale) place the potentiometer completely
to the top.
Here are graphical representations of the different waveforms used by ARP 2600V
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