4.7 OBXD

OBXD is a virtual analog synthesizer that emulates the behavior and sound of classic 1980s polyphonic synthesizers.

MASTER Section: 

• Volume: Controls the overall output level of the synthesizer.
• Tune: Fine-tunes the pitch of the entire instrument.
• Transpose: Shifts the pitch of the instrument up or down by exact musical half-steps.

GLOBAL Section: 

• Spread: Detunes the oscillators relative to each other to thicken the sound and widen the stereo image.
• Unison: Layers all available voices onto a single note for a thicker sound.
• Glide: Adjusts the portamento effect, creating a pitch slide between notes.
• Legato Display: A clickable screen area that changes how held notes behave. Options include Retrig (re-triggers envelopes on every note), Keep All (held notes continue sustaining without re-triggering), Keep fenv (maintains the filter envelope), and Keep aenv (maintains the amp envelope).
• Voices Display: Shows and allows you to set the maximum number of active voices (polyphony), typically from 1 to 8.
• VAM (Voice Allocation Mode): A toggle button that switches the priority of voice allocation from the default low-note priority to last-note priority.
• Learn & Clear: Utility buttons used to map the synthesizer's parameters to external physical MIDI controllers.

OSCILLATORS Section: 

• OSC 1 & OSC 2: These knobs control the base pitch of the two main sound generators.
• PW (Pulse Width): Changes the harmonic shape and tone of the Pulse wave.
• Saw / Puls Toggles: Turns the Sawtooth or Pulse waveforms on or off for each individual oscillator.
• Detune: Slightly alters the pitch of OSC 2.
• Sync: Forces OSC 2 to restart its waveform every time OSC 1 does, creating a sharp, tearing tone.
• XMOD (Cross Modulation): Uses OSC 1 to modulate the frequency of OSC 2, creating metallic or bell-like tones.
• Step: A toggle that forces the pitch knobs to snap to exact piano key notes instead of sliding smoothly.
• Bright: Adds extra high-frequency energy to the sound.
• P ENV (Pitch Envelope): Dictates how much the Filter Envelope affects the pitch of the oscillators.

MIX Section: 

• OSC 1 & OSC 2: Individual volume levels for the two main sound generators.
• Noise: Adds a white noise signal into the mix.

FILTER Section: 

• Cutoff: Adjusts the frequency at which the filter begins to cut the audio.
• Reso (Resonance): Adds a frequency peak at the cutoff point.
• Env: Controls how much the Filter Envelope affects the cutoff frequency.
• Key: Enables keyboard tracking, causing the filter cutoff frequency to follow the pitch of the notes you play on the keyboard.
• HQ: Enables High Quality interpolation for smoother processing of high frequencies, at the cost of higher CPU usage.

• BP: Switches the filter to a Bandpass mode.
• 24dB: Switches the filter slope to a steeper 24dB/octave low-pass mode.

MODULATION Section (Column Layout): 

• Rate & Waveforms (Column 1): The Rate knob sets the speed of the Low Frequency Oscillator (LFO). Below it, three buttons (Sine, Sqr, S&H) select the shape of the LFO. You can activate multiple shapes simultaneously to mix them.
• Pitch Destinations (Column 2): The Pitch knob controls the depth of the LFO modulation. The three buttons below it (OSC 1, OSC 2, FILTER) act as routing switches, selecting exactly which components are affected by the pitch wobble.
• PWM Destinations (Column 3): The PWM knob controls the depth of the Pulse Width Modulation. The two buttons below it (OSC 1, OSC 2) select which oscillators receive the PWM effect.

CONTROL Section: 

• Bend 12: Increases the pitch bend wheel range to 12 semitones (one octave).
• Bend OSC 2: Restricts the pitch bend wheel so it only bends Oscillator 2.
• Vibrato Rate: Sets the speed of the vibrato effect triggered by the keyboard's modulation wheel.
• Filter Env Vel: Dictates how much note velocity (key strike force) affects the filter envelope.
• Amp Env Vel: Dictates how much note velocity affects the amplifier envelope.

FILTER ENVELOPE & AMPLIFIER ENVELOPE Sections: 

• A, D, S, R: Standard Attack, Decay, Sustain, and Release knobs used to shape how fast the sound and filter brightness fade in and out when a key is pressed.

VOICE VARIATION Section: 

• Filter, Glide, Env: Emulates the natural instability of vintage analog hardware. Increasing these knobs causes the Filter, Glide, and Envelope parameters to deviate randomly from their exact settings each time a new note is triggered.

VOICE PAN Section: 

• Knobs 1-8: Controls the individual stereo panning (left/right placement) for each of the 8 polyphonic voices independently.