AQA Elektrix JVCO UP73R
The AQA UP73R module consists of one ramp core oscillator with
several wave shaper subcircuits, all having that classical vintage
tone, loved by a lot of musicians and soundsynthesists.
The VCO is capable of delivering that without sacrificing tracking
precision and low temperature drift.
Available waveshapes are saw, inverted saw, triangle, sine and PW
rectangle, which uses the saw wave from the waveshaper as a carrier
for the PWM. It can be varied by CV and manually within a range
from 0 percent to almost 100 percent.
The possibility to play VCO in low, middle and high modes, together
with the 10 turn precision Tune pot results in a very convenient
”on the fly” way of tuning the module. It's core can be frequency
modulated exponentially from two inputs, both CV controlled. When
fully open the input attenuators are calibrated for 1 V/Oct. There
is one more input - for linear modulation with manual amount
control, AC coupled and configured like differentiator. In this way
it is sure no detuning caused by DC, will take place when
modulation signal is presented at the FM Input, but only frequency
modulation, centered around the already played tone.
Syncing the core to outside source makes a whole lot of difference,
when there is the additional option to vary continuously by CV and
manually the threshold of synchronization from no sync, soft sync
and hard sync. This input is configured as attenuverter for even
more flexibility. Note when the Treshold pot is fully CW there will
be no sound output anymore. The reference wave source for the soft
sync is the saw from the oscillator. Sync input itself reacts to
every repeatable waveform with amplitude higher than 1,2 Vpp.
Width: 16 HP
1V/oct input, two frequency MOD inputs
sync input, sync threshold CV input, FM input, PWM input
waveform outputs: ramp, sawtooth, triangle, sine, pulse