Test And Calibration - Mutable Instruments Anushri Assembly Instructions Manual

Mutable Instruments | Anushri - Assembly instructions
on the PCB; and to identify the right part you can read "FA 100K" under the pot. If you are unsure which
pot is which, check the resistance between the first and third lead before soldering them.
Add the 3x 10k pots with center detent. A "CD" label is printed on the pot symbol on the PCB; and to
identify the right part you can try turning the pot and check for the click/detent at 12'o'clock. These are
used for the pulse-width, and LFO/ENV pitch and PWM modulation where the central position of the
pot corresponds to a neutral setting.
Add the remaining 16 10k pots.
Here is how it looks like with switches and knobs (not really necessary at this stage...) in place.

Test and calibration

VCO calibration
VCO calibration is needed only if you plan to use the CV in/out for accurate pitch control. Otherwise,
you can let the software tune the unit by holding the "hold" button and pressing "run/stop". You
should hear a low-volume arpeggio (played by the unit to measure the pitch produced by the VCO
for a few test voltages). When the unit is software-tuned, the VCO will react incorrectly to external
VCO CV signals, and will produce VCO CV signals which are slightly off (since they have the
compensation of software-tuning built into them).
The calibration procedure consists in the following steps:
1. Power the unit on and leave it on for a few minutes.
2. Make sure that oscillators sync is disabled. The sync switch must be to the low position.
3. Hold the "hold" button and press "rec" to disable software correction of tuning.
4. Set the pot labelled "2" to its minimal position.
5. Adjust the two VCO trimmers (offset and scale) until the synth plays in tune in the C1 - C4 range. Note
that tuning accuracy starts to degrade below 50 Hz due to some internal resistance on the SSM2164
inputs (which are not true virtual grounds), and above 2kHz due to integrator reset time compensation
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