Setting EFM1 Output Parameters

The EFM1 provides the following level controls.

Figure. Output parameters.
  • Sub Osc Level knob: Used for added bass response. The 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 the EFM1’s FM engine output.
  • Stereo Detune knob: Adds a rich and diverse chorus-like effect to the sound of the EFM1. This is achieved by doubling the EFM1 voice with a secondary, detuned FM engine. High values result in a wide stereo effect being added to the detuning, increasing the perceived space and width of your sound.

    Note: It is possible that mono compatibility can be lost with use of this parameter.

  • Vol(ume) envelope: Shapes the level of the sound over time. The volume envelope is triggered every time a MIDI note is received.
    • Attack slider: Sets the time it takes to reach the maximum volume level.
    • Decay slider: Sets the time it takes to reach the Sustain level.
    • Sustain slider: Sets a level that is held until the MIDI note is released.
    • Release slider: Sets the time it takes to reach a level of zero, after the MIDI note has been released.
  • Main Level knob: Sets the overall output level of the EFM1.
  • Velocity knob: Determines the sensitivity of the EFM1 to incoming MIDI velocity messages. The 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 (counter-clockwise) if you don’t want the EFM1 to respond to velocity.