Empress Effects ZOIA

ZOIA is a modular effects and synthesis platform in stompbox format, developed by Canadian manufacturer Empress Effects. It is not a multi-effects processor with a fixed algorithm set – it is an environment for building effects, instruments, and MIDI controllers from scratch, with over 80 modules and a continuously growing list delivered through firmware updates. A grid of 40 RGB-backlit buttons serves simultaneously as the patch interface and the connection matrix between modules. 24-bit/48 kHz converters with 32-bit internal processing. SNR above 105 dB. Power: 9 V 300 mA. Dimensions: 145×95×51 mm. Weight: approx. 460 g.

Modular architecture – what it means in practice

A standard multi-effects processor offers a fixed algorithm set with a preset routing order. In ZOIA every effect is assembled by connecting modules: LFO → filter → VCA → reverb → output is one of millions of possible signal chains. Audio modules include oscillators, filters (multiple topologies), bit crushers, granular processor, saturation, compressor, noise gate, and ring modulator. Effects modules cover reverbs (algorithms derived from the Empress Reverb pedal), delays, chorus, flanger, phaser, tremolo, overdrive/distortion, fuzz, cab simulator, and equalizer. CV and analysis modules include envelope follower, LFO (six waveform shapes), ADSR, sample and hold, comparator, slew limiter, sequencer, and CV recorder. Every parameter of every module can be modulated by the output of any other module – reverb depth controlled by an envelope follower reading guitar dynamics is the simplest possible example of what ZOIA does natively.

Patch recall, MIDI integration and signal routing

ZOIA holds up to 64 patches in internal memory; the included microSD card extends that to a library exchangeable between units and downloadable from the patchstorage.com community repository. Three footswitches handle patch switching in either scroll or bank mode, adjustable to the preferred live workflow. The rear-panel Control Port accepts CV input (0–5 V), expression pedal, and external switch. MIDI in and out (1/8" TRS, adapters included) handles MIDI program change for patch recall from external controllers as well as MIDI CC for parameter control. Stereo input and stereo output (TS 6.3 mm jacks) allow full stereo operation throughout the signal chain. A built-in Help mode displays contextual information about every module on the OLED screen without consulting the manual.

KEY FEATURES

• Modular effects and synthesis platform in stompbox format
• 80+ modules (updated via firmware): audio, CV, MIDI, effects
• 40-button RGB grid – patch interface and connection matrix
• OLED display – module info, parameters, LFO waveform shapes
• 20+ ready-made effects modules: reverbs, delays, overdrive, chorus, flanger, phaser, cab sim
• Up to 64 patches in internal memory + microSD for extended library
• CV input (Control Port), expression pedal, external switch
• MIDI I/O (1/8" TRS): program change, CC, MIDI out
• Stereo input and output (TS 6.3 mm)
• SNR above 105 dB

TECHNICAL SPECIFICATIONS

• Type: modular effects and synthesis platform, stompbox
• Number of modules: 80+ (firmware-dependent)
• Converters: 24-bit / 48 kHz
• Internal processing: 32-bit
• SNR: above 105 dB
• Interface: 40 RGB buttons + OLED display
• Audio inputs: stereo L/R (TS jack 6.3 mm)
• Audio outputs: stereo L/R (TS jack 6.3 mm)
• Control Port: CV 0–5 V, expression pedal, external switch
• MIDI: In/Out (1/8" TRS, adapters included)
• Patch memory: 64 internal + microSD
• Footswitches: 3 (scroll or bank mode)
• Power: 9 V DC, 300 mA
• Dimensions: 145 × 95 × 51 mm
• Weight: approx. 460 g
• Includes: microSD card (with adapter), MIDI adapters, user manual