The ACID track is a classic acid-box inspired monosynth: saw / square oscillator → 4-pole tanh-saturated ladder filter (in an AudioWorklet) → tanh waveshaper drive → amp envelope. Includes accent and acid-style slide.

Knobs

• Waveform — saw or square.
• Cutoff — base filter frequency (50–5000 Hz, hardware ceiling ~6 kHz).
• Reso — Q (0–25). Beyond ~22 it self-oscillates.
• EnvMod — how much the envelope opens the cutoff on each note.
• EnvDecay — speed of the cutoff envelope (0.05–2 s). The classic squelch knob.
• Accent — global accent intensity. Per-step accent in the inspector scales this.
• Drive — pre-filter saturation (saw warmth).
• AmpDecay — how long each note rings (0.05–1.5 s).
• Tuning — fixed semitone offset (±12).
• Base note — default MIDI note when a step has no per-step note (default 36 = C1).

Slide

Activate Slide on a step (the cyan S badge) and the 303 glides pitch from the previous note instead of retriggering the envelope. Pair with accent for that unmistakeable acid burble.