Variable Sample Rate; Calibration Of Tuning; Voltage Supply - Noise Engineering Cursus Iteritas Manual

Noise Engineering
Cursus Iteritas
Dynamically generated wavetable oscillator using orthogonal functions.

Variable Sample Rate

Cursus Iteritas uses a sample rate that is a multiple of the fundamental (lowest) oscillator
frequency. This moves alias power that is a multiple of the fundamental to be mapped to
a multiple of this tone, therefore making the aliasing align with the harmonics of the
tone. This works well for settings with a strong harmonic structure (spread fully CW or
fully CCW) and adds unique aliasing character for other tones.

Calibration of Tuning

Cursus comes pre-calibrated but over time it may change and need a touch up.
Pitch calibration is controlled by an linear resistor-divider network. To calibrate the tuning,
attach a volt meter (preferably 4+ digit) to the test points TPCV and TPGND on the rear panel
and adjust the trim pot.
The voltage measured should be 5/16 (.3125) times the input voltage applied to the CV input. A
reasonable way to tune the scale is to use an adjustable voltage source to generate 4 volts then
adjust the tuning trim until the test points read 1.2500V. Cursus Iteritas can also be tuned using a
reference supply capable of generating a 1 volt difference and using a stroboscope such as the
Peterson 490 to tune to an octave interval. This is method is preferred to the meter-only method.

Voltage Supply

Cursus Iteritas can run its processor on the 5V eurorack power rail to reduce noise and load on the 12V
bus. Gently push the switch tab in the direction of the desired rail to use.
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