Audio Mixer
The Audio Mixer is where all of Spirit’s sound sources come together (or split apart). It’s more than just a basic level mixer. It gives you per-source routing into two completely separate signal paths: the Filter/ADSR Path and the Shaper Y Path. You can treat each path like its own self-contained voice engine, letting you build layered textures, parallel-processing chains, or sonic mayhem.
Each of the following sound sources has its own pair of sliders:
Oscillator A
Oscillator B
Ring Modulator (Shaper Y path only)
Noise
Two Signal Paths
Each slider controls how much of that sound source goes to:
Filter/ADSR Path - the traditional subtractive synth route, passing through dual filters (Lower and Upper) and an ADSR envelope-controlled VCA.
Shaper Y Path - a more experimental path featuring a fixed 6 dB/octave lowpass Brightness filter, a VCA shaped by the Shaper Y envelope/LFO, with lots of potential for non-standard envelope behavior and audio-rate modulation. Envelope and gating behavior is controlled by the parameters in the Shaper Y section.
For example, you could send a clean triangle wave from Osc A to the Filter path for a classic lead, while routing a noisy, rectangular-width-modulated Osc B to the Shaper Y path for a modulated, glitchy underlayer. Or send both to both paths and sculpt each independently.
Brightness Control
The Brightness knob applies only to the Shaper Y path. It’s a simple, non-resonant 6 dB-per octave lowpass filter that lets you roll off high-end frequencies before the signal hits the shaping stage. Use it to tame buzziness, smooth out aggressive harmonics, or warm up overly bright signals before sculpting them further.
Want a chewy, rounded sound? Crank a saw wave into Shaper Y, then dial down Brightness. Prefer bright and buzzy? Just leave it wide open.
Ring Modulator
The Ring Mod section combines Oscillator A and B to generate a raw, metallic, sum-and-difference signal. It’s great for bell tones, sci-fi textures, or general-purpose harmonic adventures. It is only available in the Shaper Y path.
Noise
The Noise source generates pitchless signal from selectable types: red, pink, or white, switchable via a small triangle dropdown next to its label. This is your go-to for snares, wind, gritty mod content, and more. Like all sources, you can send it independently to either path with its dedicated sliders.