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Harmonically Related LFOs

author: rory allen

date: 12/01/22

labels: LFO

Six harmonically related sine/saw/square wave LFOs

digital in: Reset all LFOs
analogue in: Added to master rate
knob 1: Master rate
knob 2: Adjusts the master clock division of the currently selected LFO (or the maximum voltage for noise)
button 1, short press: Change mode of current LFO between sine/saw/square/off/random/noise
button 1, long press (> 0.5sec): Toggles between displaying all LFOs or just the currently selected one
button 2: Select the next LFO
cv1/cv2/cv3/cv4/cv5/cv6: LFO outputs

Editing/understanding the program

There is a list named divisions which controls the relationship of each LFO to the master clock, in terms of its division. You could change them to all be evenly divisible, for example [1, 2, 4, 8, 16, 32], or to be very 'unrelated', for example [1.24, 5.27, 9.46, 13.45, 17.23, 23.54]. The last example would only come back into sync after 2,472,424,774,707 cycles, which is approximately 78400 years at one second per cycle. The default example uses all prime numbers (except 1 if you want to be technical), and will only sync up around 15,015 cycles. You can change any of these values during operation of the program by using knob 2, and button 2 to change which LFO you have selected. The maximum division is controlled by the MAX_HARMONIC variable at the top of the script.

Both the division and mode (wave shape) of each LFO are saved to a file, so will be retained after shut down. For this reason there isn't much point in changing the values of the LFO divisions in code, as they will be overwritten and saved as soon as you use knob 2 to alter them.

The state of viewAllWaveforms is also saved to the same file. Therefore, you can set it and forget it to your preferred view, or toggle as desired. Either way, the previous state will be recalled on power up.

There is also a variable named MAX_VOLTAGE, which is likely only going to be 10 or 5 depending on which you prefer in your system, and what modules you are controlling. This is inherited by the MAX_OUTPUT_VOLTAGE set in europi.py, but you can override it if you use this script for something specific.