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4ms Catalyst Controller Eurorack Module , $349.00 - Add to Cart Skip to Product Information

4ms Catalyst Controller Eurorack Module

20HP Eurorack Controller Module with 8 x Dual-purpose CV/Gate Output Channel, Trigger In, CV In, CV-controllable Crossfader, Motion Recording/Playback, and Variable Scene-change Speed
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4ms Catalyst Controller Eurorack Module
4ms Catalyst Controller Eurorack Module
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4ms Catalyst Controller Eurorack Module
In Stock!

(Hurry, limited quantity available)

$46 Price Drop!
Was:

Set the Scene and Seize Your Sound

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Our Product Research Team

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Synthesis, sound design, and music production have never been more accessible, and the increasingly blurry boundary between physical, virtual, analog, and digital modes of music making has led to a cross-pollination of interfacing options that stand to enrich any creative venture. With the Catalyst Controller Eurorack module, 4ms reimagines your architectonic relationship to performance and composition with a 20HP powerhouse that lets you build a path to navigate your sound. Its eight dedicated outputs feature dual-purpose functionality for both Gate and CV signals, impressing Sweetwater’s synthesists with its capacity to manage both simultaneously. An ultra-smooth horizontal crossfader allows you to manually transition between channels, but accompanying inputs for Trigger and CV signals promote a combinatorial explosion of interoperative modulation with your setup. And with eight selectable scenes comprising eight channels each, the Catalyst Controller becomes a formidable force of symphonic synthesis possibilities.

Sculpt, shape, weave, and make

With its Catalyst Controller, 4ms have created a macro controller for your Eurorack rig, with 64 scenes of malleable musicality that can be as linear or dynamic as you need. Its voltage-controllable Pathway crossfader not only promotes an extensive array of interoperative configurations, but its morphing behavior between scenes can have its slew or lag time set to manage the speed of your scenes’ transformations. Plus, with each output capable of individually adjustable morph times, a supplementary dimension of temporal adjustment emerges to complement the linearity-breaking possibilities of hands-on control via the Pathway slider and manual scene-triggering backlit buttons. Moreover, CV outputs can be adjusted across several ranges, including ±5V, capping at +5V, +3V, or +1V, as well as its stock configuration of –5V to +10V. Further depth of control is granted with the Catalyst Controller by way of flexible quantization options, including commonplace scales, but you can go completely unquantized with confidence, thanks to its <1mV resolution. Crossfader motion can be recorded and replayed for up to 20 seconds of activity, with detailed copy/paste functions aiding in creative ideation or deploy the randomizer to inject controlled chaos into your set.

Chaos, control, and total transformation

Bear with us here, but there’s more to this cutting-edge controller than you might imagine. In fact, through holding down a specific combination of buttons, the Catalyst Controller transforms into an entirely different module: the Catalyst Sequencer. Each module shares this dual functionality, and if you decide you like one more than the other, you can even remove the faceplate, flip it over, and re-install it, thanks to the double-sided artwork that features the necessary visuals for both modules.

4ms Catalyst Controller Eurorack Module Features:

  • Malleable macro controller module offers dynamic, musical approaches to scene and track building in an economical 20HP package
  • 8-channel configuration lets you build comprehensive Pathways that can be strung together as scenes to morph between for seamless, yet deliberate sonic elements
  • Ergonomic crossfader allows for hands-on management of scene changes can be controlled via external CV for immense interoperative possibilities
  • 8 dedicated outputs can simultaneously accommodate CV and Gate signals for added depth
  • 64-scene range provides ample room for complex constructions with manual triggering via backlit face buttons
  • Morphing behavior can be adjusted for each output to support flexible temporal configurations
  • Variable slew and lag limits allows for precise control of speed changes with scenes
  • Variable CV output values and detailed quantization configurations ensure maximum musical flexibility and control
  • Channel values and gates can be randomized globally or per channel, introducing a variable degree of controlled chaos
  • Malleable copy/paste options for pages and entire channels let streamline creative workflow
  • Motion recording and playback provides up to 20 seconds of repeatable performance
  • Can be transformed to function as the 4ms Catalyst Sequencer for an entire second module’s worth of performance options, with module art printed on the double-sided faceplate

Warranty Info

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Offer applies only to single-receipt qualifying purchases. Select manufacturers may require that only the manufacturer’s products qualify towards the minimum purchase amount needed to be eligible for promotional financing. Otherwise, an invoice that meets the minimum purchase amount and contains at least one qualifying manufacturer product is eligible for promotional financing. No interest will be charged on promo purchase balance, and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Regular account terms apply to non-promo purchases. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

Offer applies only to single-receipt qualifying purchases. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

The estimated required monthly payment shown which excludes taxes and delivery equals the amount financed divided by the number of months in the promo period, rounded up to the next cent. During the last month(s) of the promo period the required monthly payment may be reduced due to this rounding. These payments apply only with the financing offer shown. If you make these payments by the due date each month, you should pay off this amount financed within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.

Applies only to select items from this manufacturer. Ask your Sweetwater Sales Engineer for more details.