Eurorack Control Voltage (CV) Signals from synthio #AdafruitPlayground #FeaturedNote @Adafruit

synthio_DC_DAC_test.png

This note describes the process of searching for a way to output Eurorack CV (control voltage) signals from synthio via the I2S DAC using an audiobusio connection on a UM FeatherS2.

Problem Statement: When using a CV-like object in synthio such as Envelope and LFO to control a Note’s amplitude, the resultant output is placed above the baseline voltage and only responds to positive control values. For example, a sine-wave LFO created to span negative and positive values to modulate a note’s frequency is rectified if used to modulate a note’s amplitude. This becomes important when an analog output of just the Envelope or LFO is needed rather than the modulated sound of the Note oscillator.

Read more at Eurorack Control Voltage (CV) Signals from synthio


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