MATRIXSYNTH: Montage M8X FM-X walkthrough: Patch from scratch tutorial on Yamaha's latest FM synthesizer


Sunday, November 23, 2025

Montage M8X FM-X walkthrough: Patch from scratch tutorial on Yamaha's latest FM synthesizer


video upload by Floyd Steinberg

"FM-X is the FM synthesis engine found in the Yamaha MODX and Montage Series. With 8 operators per voice and 128 voice polyphony, this is a very capable sound generator. In this video, I create a "Piano with pads and sparkles" sound, explaining which options do what in the process. This is not a complete overview, just the process of making one particular patch and explaining every step.
Table of contents:

00:00 introduction, overview and terminology
00:55 selecting the FM-X engine and opening the editor
01:24 selecting an algorithm
02:15 quick editor, and explaining the algorithm
02:46 operator envelopes
03:43 velocity sensitivity
04:05 setting up the first modulator: ratio, level, envelope and velocity
05:30 second carrier and modulator: tuning
07:22 building the pad: distorting the waveshape with the spectral option
08:14 skirt value (oscilloscope view)
09:00 tuning/detuning and browsing some more spectral options (including resonance)
10:17 adding another operator and modulator
11:15 putting it all together / fine adjustments
11:37 adding LFOs for pitch and amp modulation
14:03 adding a "sparkle" with modulator 3
16:46 filter type, LFOs and envelopes
18:29 FM color
19:16 effects: insert and global
20:24 physical controls (mod wheel and poly aftertouch)
21:33 the result - a new age pad with some alien weirdness
22:55 conclusion - do the youtube thing! :-)

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