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Chapter 4 EFM1 115
EFM1 output parameters
EFM1 provides the following level controls.
Velocity knob
Stereo Detune knob
Main Level knobVolume envelope
Sub Osc Level knob
Output parameters
•
Sub Osc Level knob: Rotate to introduce a sub-oscillator signal that enhances bass response.
EFM1 features a sine wave sub-oscillator. This operates one octave below the FM engine, as
determined by the Transpose parameter. Turning up the Sub Osc Level control mixes the sub-
oscillator sine wave with EFM1’s FM engine output.
•
Stereo Detune knob: Rotate to add a chorus-like eect to the sound. This is achieved by
doubling the EFM1 voice with a secondary, detuned FM engine. High values result in a wide
stereo eect being added to the detuning, thus increasing the perceived space and width of
your sound.
Note: It is possible that mono compatibility could be lost with use of this parameter.
•
Volume Env(elope): Shapes the level of the sound over time. The volume envelope is triggered
every time a MIDI note is received.
•
A(ttack) slider: Move to set the time it takes to reach the maximum volume level.
•
D(ecay) slider: Move to set the time it takes to reach the Sustain level.
•
S(ustain) slider: Move to set a level that is held until the MIDI note is released.
•
R(elease) slider: Move to set the time it takes to reach a level of 0, after the MIDI note has
been released.
•
Main Level knob: Rotate to set the overall output level of EFM1.
•
Velocity knob: Rotate to determine the sensitivity of EFM1 to incoming MIDI velocity messages.
EFM1 dynamically reacts to MIDI velocity messages—harder playing will result in a brighter
and louder sound. Set the Velocity control all the way to the left—counterclockwise—if you
don’t want EFM1 to respond to velocity.