Erica Synths Acidbox III – Stereo Polivoks Filter with Grit and Modulation

The Acidbox III distills the raw, iconic Polivoks filter into a compact desktop powerhouse. This stereo analog filter, complete with envelope follower, syncable LFO, and expressive overdrive, brings gritty character, hands-on modulation, and flexible control to any signal chain.

Key Features

• Stereo Polivoks VCF: Authentic low-pass/band-pass filter using original-inspired op-amps for rich, uneven resonance in each channel
• Overdrive circuit: Warm to aggressive saturation via drive and input gain controls
• Syncable LFO with eight waveforms: Shape filter movement with tap-tempo and divider/multiplier control
• Envelope follower: Modulates cutoff based on input dynamics, adjustable for depth and polarity
• Manual and CV control: Cutoff frequency adjustable via knob, CV input, or configurable control input
• Configurable control input: Assign to footswitch bypass, expression pedal, external LFO, or cutoff CV
• Adjustable input gain: Accommodates guitars, line-level synths, grooveboxes, or modular sources

Customer Benefits

Acidbox III brings character and modulation to your tone without requiring patch cables. Use it to add direction and movement to static synth lines, color drum loops with gritty resonance, or create self-modulating textures with the envelope follower. Stereo I/O and flexible control modes make it a versatile sonic color box for both studio and stage applications.

Quick Specs

• Filter modes: Stereo low-pass and band-pass Polivoks VCF
• Modulation: LFO (8 waveforms, syncable, tap-tempo, divider)
• Envelope follower: Depth and attenuverter control
• Control paths: Manual cutoff, CV input, configurable footswitch/exp pedal input
• Input gain: Up to +20 dB
• I/O: Stereo ¼″ audio in/out; ¼″ CV control input
• Power: Universal 110–220 V adapter included
• Dimensions (W × D × H): 18.5 × 14 × 5.5 cm
• Weight: 0.7 kg

What’s in the Box

• Erica Synths Acidbox III
• Universal 12 V DC power supply
• User manual

Use Cases / Ideal For

Perfect for synth players, producers, and experimental artists. It excels in adding life to static signals, creating dub-like swells, rhythmic filter sweeps, or adding analog grit to digital tracks—ideal for both performance and sound design.

Compatibility

Designed for line-level and modular gear via stereo I/O and CV inputs. Footswitch, expression pedal, or external LFO/clock can modulate or bypass with ease—integrates smoothly into live and studio environments.

Pros & Cons

✅ Pros:

• Distinctive Polivoks filter character in stereo
• Flexible modulation: LFO, envelope follower, manual & CV control
• Performance-ready control options with real-time interaction

⚠️ Cons:

• No built-in wet/dry mix or level output control
• Solely a filter—may need complementary effects for full stereo processing chain

Erica Synths Acidbox III offers a raw analog sound with performative immediacy.