The opcode diode_ringmod is not part of the official Csound ditribution, but is a Csound-plugin. It can be found here: https://github.com/csound-plugins/csound-plugins
(The Blue effect is grey to reflect the status)
Please build the plugins yourself in order to use this effect!

DESCRIPTION:

diode_ringmod is a ring modulator with optional non-linearities. It implements a built-in sinusoidal carrier signal.
The carrier is passed through a diode simulation prior to being multiplied with the input. This signal passes through a feedback stage.

CONTROLLERS:

ON/OFF - bypass
Frequency - the carrier's frequency (a sine wave)
Feedback - the amount of feedback
Linearity - the amount of non linearities
diode - if on, the carrier is passed through a diode rectification stage
mix - mix direct signal with effect

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version 1.02, July 2020
- added BSB information comments

version 1.01, May 2020
- added comments on controllers

version 1.0, September 2019
- initial version by Menno Knevel