This document provides a foundational understanding of how the Yamaha DX27/27S generates complex voices using digital FM synthesis. It details the interaction between operators, which combine sine wave oscillators with envelope generators to create diverse sound spectra.
The guide covers the specific algorithms available on the unit, explaining how modulators and carriers can be connected vertically or horizontally to alter timbre and harmonic structure. Additionally, it describes the five parameters of the envelope generator (Attack Rate, Decay 1 Rate/Level, Delay 2 Rate, and Release Rate) that control the volume and timbre evolution of a note.
The DX27/27S voice generator has four operators.
One editing function permits the feedback level to be set from 0 to 7.
The envelope may take over 9 seconds depending on the setting of AR.