Protostar

Envelope Filter

Envelope filter with harmonic density engine, LFO, 4 filter modes, CV patch bay, expression—400mA/9V, 124x99x61mm.

The Protostar delivers envelope filter functionality expanded into comprehensive harmonic density engine combining traditional auto-wah response with built-in LFO, 4 filter modes, full CV patch bay, and expression pedal input addressing experimental players seeking modular-synthesizer-style control depth in pedal format. Envelope filter responds to pick attack dynamics automatically sweeping filter frequency creating classic auto-wah quack, harmonic density engine adds complex tonal shaping impossible with simple envelope followers. Built-in LFO provides rhythmic modulation of filter parameters independent from envelope response creating pulsing textures, 4 filter modes provide distinct tonal characters from classic wah through resonant sweeps.

Full CV patch bay with nominal 0-5V range enables integration into modular synthesizer systems or control via external CV sources, expression pedal input accepts 10k-1M pot with TRS connection for real-time parameter control. All inputs/outputs protected, patch points accept mono or stereo cables though signals remain mono. End-of-chain compressor prevents excessive volume spikes during resonant filter sweeps, dry/wet mix enables parallel filtering/compression effects blending filtered signal with clean bass maintaining definition. LFO CV sensitivity and compressor gain adjustable internally. Internal bipolar 12V power supply provides increased headroom. Relay true bypass.

Dimensions 124x99x61mm (4.9x3.9x2.4"), requires Boss-style 9VDC center-negative power at 400mA draw (1A supply recommended, do not exceed 9V). The Protostar targets bass players and synthesizer enthusiasts seeking envelope filter with modular-synthesizer-style control depth, suitable for funk (classic auto-wah quack), experimental electronic music (LFO-modulated filter sweeps), and studio sound design where CV integration and harmonic density engine create complex filtered textures impossible with standard auto-wah pedals lacking modular connectivity.