Under the Hood: Vita Synths 4X-AT-85 MKII

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If you’re looking to add some crunchy, characterful grit to your Eurorack setup, the Vita Synths 4X-AT-85 MKII is a module that should be on your radar. This lo-fi drum module is all about delivering that classic 8-bit sound, pulling its inspiration from an 8-bit architecture to create a unique and nostalgic sonic palette.

Based in Prague, Czechia, Vita Synths has packed a ton of functionality into this 20HP module, making it a powerful rhythm hub for any rack.

Overview

The 4X-AT-85 MKII is a 4-channel, 8-bit lo-fi drum module. At its core, it features four microcontrollers that house a total of 32 (4×8) distinct lo-fi drum sounds. It’s designed not just as a sound source, but as a performance tool, thanks to its built-in mixer and, most notably, dedicated external effect loops for each channel. This allows you to send your kick to a dirty distortion and your snare to a washed-out reverb, all from a single, integrated unit.

Features List

  • Sound Engine: 4-channel 8-bit digital drum module
  • Sound Bank: 32 (4×8) built-in lo-fi drum sounds
  • Mixer: Integrated 4-channel mixer with independent level controls
  • FX Loops: Per-channel FX Send and Return, allowing for individual external processing
  • Mutes: Per-channel mute switches for live performance and arrangement
  • Triggering: Responds to falling-edge trigger/gate signals
  • Format: Eurorack
  • Width: 20HP
  • Power: 65 mA (+12V), 0 mA (-12V)

Summary Table

FeatureSpecification
ProductVita Synths 4X-AT-85 MKII
Type8-bit Lo-Fi Drum Module
Channels4
Total Sounds32
Width20HP
Depth30mm
Power+12V: 65mA
Key FeaturesBuilt-in Mixer, Per-Channel FX Send/Return, Mute Switches

Comparison: 4X-AT-85 (Original) vs. 4X-AT-85 MKII

Feature4X-AT-85 (Original)4X-AT-85 MKII (Improved Version)
Sound Library32 total sounds (4 channels x 8 sounds)16 total sounds (4 channels x 4 new sounds)
Sound QualityStandard 8-bit sounds.“Much better” sounding samples, optimized data.
Audio OutputStandard level.Loud audio output.
TriggeringTriggers on the falling edge of the pulse, which could introduce a slight delay.Triggers at the start of the pulse, eliminating delay for tighter response.
Audio CircuitStandard operational amplifier.Upgraded OPA2134PA op-amp for a “warm tone.”
Filtering (LPF)Single Low-Pass Filter stage.Precisely tuned LPFs plus a second, switchable LPF stage per channel.
ControlsToggle switches for mutes/functions.Push-button switches for easier control.
Circuit ProtectionTrigger inputs were not protected.Trigger inputs are protected against negative voltage, allowing for safe experimentation (e.g., bipolar LFOs).
Appearance(Not specified, likely black or standard panel)Stylish blue front panel.

Summary of Differences

While the original 4X-AT-85 offered a larger library of 32 sounds, the 4X-AT-85 MKII is a technical refinement. It focuses on higher-quality (though fewer) sounds, a much louder output, and zero-latency triggering. The upgraded op-amp, switchable filters, and protected inputs make it a more robust and sonically refined module for performance and sound design.

Pricing & Availability

The module appears to be available for purchase directly from the Vita Synths Etsy store and various used marketplaces. It is not a new-release product and has been available for some time.

Pricing is sourced from various online listings and may vary.

CurrencyPrice (Approx.)
USD$160 – $192
GBP£146.33
AUDA$293.25
EUROAvailable, but price not specified.

Regional Availability

  • USA: Available. Ships to the USA (a review noted fast shipping to California).
  • UK: Available. The seller’s page lists free delivery to the UK.
  • Europe: Available. The shop is based in Prague, Czechia.
  • Australia: Available. The module is listed on the Australian Etsy site.

Footnotes