draft: false
Name: JP8k-sandsquall
short-description: JP-inspired Supersaw oscillator with CV/MIDI synth and a web-editable sting sequencer.
summary: >
  A Workshop Computer JP-inspired Supersaw voice: a wide, animated stack of
  saw oscillators with a web-editable built-in sequencer and a familiar default
  phrase. Sent editor patterns are restored after power cycling. Flip Z up for
  a playable CV/MIDI synth voice, or set Z middle for a clockable 32-step
  sequencer. From sequencer mode, Z down starts or stops the
  internal sequencer when no clock is active.
  X spreads seven fixed-point saw oscillators, while Y darkens or brightens the
  stack before it leaves the stereo audio outs. USB MIDI works in both device
  and host modes for note/gate playability, pitch bend, and basic CC control.
Language: C++ (Pico SDK + ComputerCard)
Creator: Adrian Vos
Version: "0.1.23"
Status: Beta
License: MIT
date-created: 2026-09-01
date-updated: 2026-09-30
Editor: web

tags:
  - oscillator
  - synthesizer
  - supersaw
  - drone
  - cv-gate
  - virtual-analog

panel:
  inputs:
    - id: AudioIn1
      name: Pitch CV
      description: Calibrated 1V/oct pitch CV added to Main in synth mode, or to the active MIDI/sequencer note; uses ComputerCard 0.4.0 audio-input calibration when available, with a 341-counts-per-volt fallback
    - id: CVIn1
      name: Filter CV
      description: Bipolar cutoff modulation added to the Y brightness setting before the two-pole low-pass filter
    - id: CVIn2
      name: Spread CV
      description: Adds modulation to the detune/spread amount set by X
    - id: PulseIn1
      name: Gate / Reset
      description: Sustains the synth envelope while high in Z-up synth mode; resets the sequencer in Z-middle sequencer mode
    - id: PulseIn2
      name: Accent / Clock
      description: Its rising edge triggers a bright attack snap and it adds a level lift while high in synth mode; clocks the sequencer from rising edges captured at audio rate in sequencer mode, taking priority over USB MIDI Clock
  outputs:
    - id: AudioOut1
      name: Left / Mono
      description: Supersaw voice output
    - id: AudioOut2
      name: Right
      description: Stereo companion output in all modes
    - id: CVOut1
      name: Pitch Monitor
      description: Approximate 1V/oct monitor derived from the internal pitch value
    - id: CVOut2
      name: Brightness Monitor
      description: CV following the effective two-pole filter coefficient, including Y, CV In 1, and the sequencer brightness contour
    - id: PulseOut1
      name: Gate Monitor
      description: High while the incoming or sequenced gate is active; falls at note-off before the short audio release tail
    - id: PulseOut2
      name: Saw Clock
      description: Square pulse derived from the centre oscillator phase while the voice is active

controls:
  switch:
    up:
      name: Synth
      description: CV/gate and USB MIDI playable supersaw voice
    middle:
      name: Sequencer
      description: Quietly armed 32-step sequencer. Use Z down to start or stop its internal clock; Pulse In 2 or active USB MIDI Clock clocks it externally
    down:
      name: Start / Stop
      description: From sequencer mode with no external clock, starts or stops the internal clock; neutral in synth mode
  knobs:
    - main:
        name: Tune
        description: Tune/transpose in synth mode; tempo in sequencer mode; ignored while a MIDI note is active
      x:
        name: Spread
        description: Detunes the seven saw oscillators from single-saw tuning mode at minimum to a wide supersaw cloud
      y:
        name: Brightness
        description: Neutral two-pole low-pass tone control from warm pad to bright raw saw
  leds:
    - display: list
      items:
        - id: LED0
          name: Synth Mode
          description: Bright in Z-up synth mode and dim in sequencer mode
        - id: LED1
          name: Width / Sequencer Tick
          description: Brightness follows stereo spread in synth mode and pulses with sequencer movement in sequencer mode
        - id: LED2
          name: Gate
          description: Lit while the voice is open
        - id: LED3
          name: Brightness
          description: Brightness follows the Y tone control
        - id: LED4
          name: USB MIDI
          description: Dim in USB device mode, brighter in USB host mode, and stays bright while USB MIDI Clock is active
        - id: LED5
          name: Envelope / MIDI Note
          description: Brightness follows the envelope, or stays bright while a MIDI note is held