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4ms Catalyst Sequencer Eurorack Module , $395.00 - Add to Cart Skip to Product Information

4ms Catalyst Sequencer Eurorack Module

20HP Eurorack Sequencer Module with 64-step Sequencer, Phase-based Sequencing, 8 x Dual-purpose CV/Gate Out, Clock In, Scrub Crossfader, and Variable Output Voltage
Item ID: CatalystSeq
4ms Catalyst Sequencer Eurorack Module
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4ms Catalyst Sequencer Eurorack Module
In Stock!

(Hurry, limited quantity available)

Shift Synthesis Paradigms with Cutting-edge Multimode Sequencing

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Our Product Research Team

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Sequencing has long been the most significant architectonic force of rhythm, structure, and order in Eurorack synthesis, supplying a malleable framework to build your sound. Now, via the Catalyst Sequencer, 4ms has reimagined the way we interface with sound and structure. This Eurorack module supplies a galvanizing blend of classic clocked-step sequencing and an unorthodox phase-based sequencer that has Sweetwater’s synthesists eager to deploy. Outfitted with eight dedicated outputs, the Catalyst Sequencer simultaneously accommodates CV and Gate signals throughout its 64-step capacity. Phase-based sequencing, however, utilizes the phase values of the incoming waveform to drive the behavior of the sequencer, irrespective of the channels starting step or length. Ramp-up signals move the sequence forward, while the inverse moves them backward. What about a triangle wave? That will result in a seamless ping-pong movement, and complex waveforms will evoke equally complicated patterns that can be used to break continuity or imbue your performances with a nuanced, controlled chaos. In addition to detailed management of CV output values, variable transposition options, channel-based behavioral adjustments, and flexible quantization, the Catalyst Sequencer features a horizontal Phase Scrub slider to manually move through your sequence, perfect for hands-on adjustments in live performances or studio jams.

Harness the momentum of your sound

Detail and versatility abound throughout the Catalyst Sequencer, offering near-limitless configurations of its 8-channel, 64-step architecture across CV and Gate signals, offering simultaneous, multi-module management of rhythms, leads, and more. The module’s range of musicality starts with its variable CV-output range, operating from –5V to +10V, out of the box, but this can be painlessly switched to ±5V, as well as capped at +5V, +3V, or +1V. Moreover, CV outputs can be quantized to a range of common scales, yet 4ms gives you an unquantized option with a precise, sub–1mV resolution. Flexible transposition options include both global and per-channel changes, with the onboard Randomizer capable of channel-specific randomization parameters for channel and gate values. Plus, sequencer momentum can be adjusted for each step of its expansive range to perform with glissando or ratcheted gating.

Chaos, control, and total transformation

Bear with us here, but there’s more to this game-changing sequencer than you might imagine. In fact, through holding down a specific combination of buttons, the Catalyst Sequencer transforms into an entirely different module: the Catalyst Controller. 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 Sequencer Eurorack Module Features:

  • Multimode clock-based and phase-based sequencing module offers dynamic, musical approaches to sequencing in an economical 20HP module
  • Phase-based sequencing utilizes phase values of incoming CV signals to dictate sequencer behavior, ranging from bidirectional linear and ping-pong to complex and chaotic
  • 8 dedicated outputs can simultaneously accommodate CV and Gate signals for added depth
  • 64-step sequencing range provides ample room for complex constructions
  • Each of its 8 channels can be individually adjusted for starting points, step length, and reset destinations to allow for even further modularity in sound design
  • 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
  • Can be transformed to function as the 4ms Catalyst Controller 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.