Faug

A Minimoog Model D emulation with the DSP portion written in Faust. Moog + Faust = Faug

Controllers Section:

• Tune Knob: Global detune ranging from [-2.5, 2.5] semi-tones
• Glide Knob : Glide rate/portamento, max time ~6sec
• Modulation Mix Knob: Mixes between modulation sources determined by buttons below
• Osc-3/Filter Eg Button: Determines mod source added by left side of the Modulation Mix knob
  • Osc-3: Osc three signal is modulation source
  • Filter EG: Filter Envelope Generator is modulation source
• Noise/LFO Button: Determines mod source added by Right side of the Modulation Mix knob
  • Noise: Noise is modulation source
    • White Noise in mixer section means pink noise for noise modulation source
    • Pink Noise in mixer section means red noise for noise modulation source
  • LFO: LFO is modulation source

Keyboard Section:

• LFO Rate Knob: Frequency of dedicated modulation Low Frequency Oscillator: [0.5Hz,200Hz]
  • ToDo: LFO Shape toggle
• Pitch Wheel: Pitch bend for while playing.
  • ToDo: Setting to send wheel automatically back to center when released
• Mod Wheel: Modulation Amount to modulation targets
• Glide Button:
  • Activates glide/portamento when notes are played with no seperation
• Decay Button:
  • Applies an Envelope's decay setting to it's release stage
  • Release is ~10ms when turned off

Oscillator Bank:

• Oscillator Modulation Button: Turns on modulation source routing to Oscillators 1 and 2
  • Oscillator 3 doesn't get modulated b/c it is a modulation source
• Osc-3 Control Button: Connects Oscillator 3's frequency to the keyboard input
  • Uses Keyboard center of C3 - Midi Note 48 - 130.81Hz as input frequency when Oscillator 3 disengaged from keyboard
• Range Column:
  • Octave for pitch of respective oscillator
  • Units are feet - tradition from organ pipes
  • Midi Note 93(A6) at 16' plays 440Hz(A4)
  • Lo mode uses aliasing oscillators since the pitch is in a range aliasing shouldn't occur
• Frequency column:
  • Detune for Oscillators 2 and 3
  • Range of [-7.5,7.5] semi-tones
  • Oscillator 1 doesn't get detuned as it serves as a reference for the other two
• Waveform column:
  • Triangle: Triangle wave
  • Triangle+Saw: Oscillators 1 & 2: A triangle and saw wave added together
  • Reverse Saw: Oscillator 3: A saw wave that ramps down instead of ramping up

  <li>Saw: Saw Wave, ramps up</li>
  <li>Square: Square Wave</li>
  <li>Rectangle: Rectangle Wave-Pulse train with 0.7 duty cycle </li>
  <li>Narrow Rectangle: Rectangle Wave-Pulse train with 0.85 duty cycle </li>

Mixer Section:

• Left Column of knobs: Volume knobs for their respective oscillators
  • Volume Knob for Oscillator 3 has no impact on it's contribution to modulation signal
• Center Column of buttons: On/Off buttons for their respective noise sources contribution to the sound signal path
  • On/Off buttons for Oscillator 3 and Noise have no impact on they're contributions to the modulation signal
• Right Column:
  • Load Screw/knob: Increases the output of Oscillators and Noise(not feedback) before being fed into the filter
    • ToDo: Include a warm little light that increases in brightness with load
    • ToDo: Improve/build upon scaling/saturation algorithms
  • Feedback Amount: Amount of the signal's output that gets fed back to the input
    • ToDo: Improve and build upon feedback saturation/processing
  • Noise Volume: Volume knob for noise signal's contribution to sound signal
    • Has no impact on noise's contribution to modulation signal
  • Noise-Type Button: Determines noise type for sound and modulation signals
    • White Noise for sound signal is Pink Noise for modulation Signal
    • Pink Noise for sound signal is Red Noise for modulation Signal

Filter Section:

Faust Libraries-vaeffects emulation of traditional moog 4th order ladder filter

• Filter Modulation Button: Turns on modulation of filter cutoff by modulation sources
• Keyboard Control:
  • Keyboard Control 1: Turns on 1/3 of key tracking for filter cutoff
  • Keyboard Control 2: Turns on 2/3 of key tracking for filter cutoff
  • Turning on both gives full keyboard tracking eg. Filter cutoff will move 1:1 with change in played pitch
• Cutoff Frequency Knob: Determines base cutoff of filter: range [10Hz,20kHz]
• Emphasis Knob: Controls the amount of filter signal fed back into filter, resulting in a resonance peak at cutoff
  • Self-Oscillation occurs at max value
  • ToDo: Add scaling to reduce emphasis as cutoff freq goes down so bass notes still have bass frequencies
• Contour Amount Knob: Adjusts the amount that the Filter's envelope generator impacts the filter cutoff
  • Max Range of 4 octaves
  • ToDo: Add filter direction toggle
• Attack Time Knob: The amount of time it takes for the filter cutoff to go from the base frequency to max or min cutoff frequency.
  • Value Range: [1ms, 7s]
  • Peak change amount is determined by Contour Amount knob.
• Sustain Level Knob: The percent of difference between filter cutoff and contour peak for the cutoff frequency to stay at after Decay Phase
  • Value Range: [0%, 100%]
  • 0%: After the Attack phase, the filter cutoff will decay to the base cutoff frequency set by the knob
  • 50%: If contour is set to max(4 octaves), the filter cutoff will decay to 2 octaves above base cutoff frequency determined by knob
  • 100%: After the Attack phase, the filter cutoff will not decay at all and will sustain at peak value until note is released
• Decay Time Knob: The amount of time it takes for the filter cutoff to go from the max or min cutoff frequency to Sustain level
  • Value Range: [4ms, 30s]
  • Begins immediately after Attack phase ends
• Release for filter envelope is either 10ms, or Decay Time value if Decay Button in keyboard section is on
• ToDo: Add different cutoff slopes/filter implementations

Loudness Contour:

• Attack Time Knob: The amount of time it takes for the volume to reach it's peak.
  • Value Range: [1ms, 10s]
  • Peak determined by the Volume Knob in Power Section.
• Sustain Level Knob: Volume level held after decay
  • Value Range: [0%, 100%]
  • 0%: Volume will decay to nothing
  • 100%: No volume decay after attack until note released
• Decay Time Knob: The amount of time it takes for the filter cutoff to go from the max or min cutoff frequency to Sustain level
  • Value Range: [4ms, 24s]
  • Begins immediately after Attack phase ends
• Release for envelope is either 10ms, or Decay Time value if Decay Button in keyboard section is on

Power Section:

• Volume Knob: Scales overall output
• Power Button: Turns output on/off
  • ToDo: Add a warm up process

Other ToDos:

• UI Labels/knob ticks need some fine-tuning to line up
• Variable key tracking for notes
• Variable detune/drift
• Settings page to allow for these and other adjustments
• Oversampling
• Alternate UI view when no onscreen keyboard is needed
  • Different layout, more of a rack/vertical style?
  • Add Loudness Meter
  • Add Spectrum graph
  • Add Waveform graph
  • Add to settings page to toggle them on/off
• UI/visual cues to inform user which buttons are flipped on
• Contour generator builds on itself when decay button is on
• Replace various curves and contours with exponential implementations