Controls
ALT has a linear response: the amplification
is in direct linear proportion to the control
voltage input (see Fig. 1).
• GAIN
This control sets the initial level of
amplification. This value is summed to the
CV applied at the CV input. The maximum
bias is 5V which provides a gain of 1.
(see Fig. 1)
At minimum level with no CV present,
there is no signal at the VCA’s output. Once
the gain control is turned up, amplification
occurs (see Fig. 2), even if there is no CV
input present.
The gain control shifts the whole VCA
response upwards.
• CV
Amplitude attenuverter. Adjusts the amount
and polarity of amplitude modulation from
the CV input.
lin
voltage control
amplification
lin
voltage control
amplification
Fig.1 Response curve for ALT
Fig. 2 Effect of GAIN control on VCA response
NANO Modules - València 2019 ©
ALT
Inputs & Outputs
• Inputs
/1 - 4
These are the 4 signal inputs of the amplifiers,
which are DC coupled. This means that audio,
CV and trigger signals can be fed here.
/CV 1,2,3
CV inputs for the GAIN of the amplifiers, which
can be controlled with its CV attenuverters.
The voltage is summed with the bias control.
The VCA is fully open with 5V CV, and clips
voltages above this level.
/CV 4
This CV input is normalled to internal 5V (fully
open VCA) and can be controlled with any
external voltage.
1 2 3 4
CV1 CV2 CV3 CV4
1 2 3 4
gain
