ADDAC SYSTEM
page 16
TUNING THE DECAY
1. Set the [VCA Decay] knob fully CCW
2. Send a trigger to the [Input] jack
3. Set Input Gain knob to 12 o’clock
4. Adjust the trimmer until there’s a very short decay
5. Set the [VCA Decay] knob fully CW and compare the decay time
6. Re-adjust the trimmer if longer times are prefered.
TUNING THE ACCENT
1. Patch a 5v signal into the [Input] jack
2. Adjust the [Input Gain] to a level prior to distorting
3. Patch a gate signal into the [Accent] jack
notice the difference in volume when this gate is on
4. Adjust the Accent Intensity trimmer to a level of your choice
TUNING THE 1V/OCTAVE:
Turn on the 107 and wait 20 to 30 mins for the VCO to heat up.
1. Set the VCO to Triangle mode.
2. Set the Frequency knob to full CCW.
3. Center the Fine Tune knob.
4. Turn the Freq.CV knob to full CW.
5. Center the Input Gain knob.
6. Turn the 1V/OCT trimmer all the way full CW.
7. Feed a steady CV source of around 5 Volts to the ACCENT Input.
8. Feed a C3 CV signal (3 Volts) to the FREQ CV input and tune the
F.INIT trimmer to C3.
9. Feed a C1 CV signal (1 Volt) to the FREQ CV input and tune the
1V/OCT trimmer to C1.
10. Repeat step 8 and 9 until C1 and C3 are in tune when you
change between 1 Volt and 3 Volts.
Extra tips:
-Be sure the tall jumper on the panel is installed!
-The Filter should be set to LP mode, Cutoff knob full CW and the
Resonance knob full CCW.
-Notice that some CV inputs might be normalized internally, depend-
ing on your back jumpers configuration and can interact with the
filter section etc.
-Tune the VCO with your windows closed and turn off any fans/AC.
This VCO is sensitive to sudden temperature changes so a stable
room temperature while you're tuning the VCO will help the process.
Calibration
ACCENT
INTENSITY
1V/OCT
F.INIT
(INITIAL
FREQUENCY)
DECAY
TRIMMER LOCATIONS
ADDAC107 Assembly Guide
