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Format: 4K + SOUND, narrated, annotated, duration 24 mins.
The main Audulus synth patch sound exploration starts at 12:30 after some narrated theory and analysis in Wolfram Mathematica (which is worth listening to if you wish to know exactly what the patch does and does not do).
True FM directly from the signal equation for FM is demonstrated in Wolfram Mathematica, along with analysis of the instantaneous frequency after Carson's d/dt method, and why just using that directly in an oscillator without integration back to phase is NOT actual FM (and even if it is easily implemented and thus has become a proxy of sorts for real FM)! That frequently used greatly simplified technique using the instantaneous frequency to drive a phasor or oscillator directly is called here "Pseudo FM" and implemented in the node-based Audulus synthesizer, along with a pseudo version of a fully time-dependent signal form called here FT that evolves in time and makes some fascinating SciFi like sounds.
It has not yet been decided whether the Audulus patch itself will be made available.
You have the permission of Webel IT Australia to use this video AS IS for non-commercial (strictly only) educational purposes with full attribution to Webel IT Australia as the video creator. Creation of derivate videos or presentations is NOT permitted, and recording of the synth sounds for use in other derivative creations is NOT permitted.
With thanks to the Audulus developers and community for this brilliant software and for making a free version available to the public!
DISCLAIMER: This educational presentation by Webel IT Australia is for solely non-commercial purposes and does not represent Audulus LLC.
© Copyright 2026 Darren R C Kelly (Webel IT Australia). All rights reserved.