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15 EFM1
The 16-voice EFM1 is a simple, but powerful, frequency
modulation synthesizer.
It produces the typically rich bell and digital sounds that frequency modulation (FM)
synthesis has become synonymous with.
At the core of the EFM1 engine, you’ll find a multi-wave modulator oscillator and a sine
wave carrier oscillator. The Modulator oscillator modulates the frequency of the carrier
oscillator within the audio range, thus producing new harmonics. These harmonics are
known as sidebands.
The EFM1 is divided into several areas.
 The top section contains the global Transpose, Tune, Glide, Voices, and Unison
parameters.
 The FM engine consists of the Modulator and Carrier parameters (raised, darker
sections), and the FM controls, including the modulation envelope and LFO shown in
the mushroom-shaped area in the center.