Acme Revival is an independent repair network that operates separately from the manufacturers whose devices we service. Our independence enables a repair model that exists beyond manufacturer-controlled strategies, while preserving the ability to work with manufacturers where appropriate.
4ms Company is a U.S. boutique electronic musical-instrument manufacturer specializing primarily in Eurorack modular synthesizer hardware. Founded by Dan Green, the company evolved from experimental effects pedals and tabletop noise devices into a well-known Eurorack maker producing oscillators, sequencers, clock and modulation modules, samplers, delays, filters/resonators, mixers, power systems, and compact Pod modular cases. Its better-known designs include the Spectral Multiband Resonator, Dual Looping Delay, Ensemble Oscillator, Spherical Wavetable Navigator, MetaModule, Catalyst Sequencer, Rotating Clock Divider, and Shuffling Clock Multiplier. 4ms emphasizes original circuit design rather than reproductions of classic synthesizer circuits, and it also supports DIY builders through kits and open-source designs.
4ms Eurorack modules can develop a complete no-power condition caused by power-input faults, damaged regulators, supply-rail problems, or failed board components. Repair records specifically document 4ms modules arriving with a "not powering up" complaint.
Sampler and Stereo Triggered Sampler units can stutter, fail to load samples, lose sample libraries, or behave erratically when the microSD card becomes slow, corrupted, incompatible, or worn. 4ms specifically identifies microSD performance as a cause of looping-playback stuttering.
Quad Clock Distributor units can develop incorrect Div/Mult knob positions where the selected division or multiplication is displaced by one or more steps. 4ms identifies recalibration as the normal corrective action for this condition.
Ensemble Oscillator, Spherical Wavetable Navigator, STS, and other pitch-controlled digital modules can develop inaccurate tracking, scaling, or tuning across octaves. Recalibration of the CV input typically restores correct 1V/oct response unless an analog input-stage fault is present.
Digital modules including the Dual Looping Delay, SMR, SWN, STS, and Ensemble Oscillator can fail to boot correctly or behave abnormally following an interrupted or unsuccessful firmware update. 4ms documents update failures requiring the loading procedure to be repeated and, in some cases, a factory reset.
Dual Looping Delay and other multi-channel DSP modules can develop a channel that passes dry audio but no longer processes the expected delay or effect. Users have reported individual DLD channels becoming inactive or failing to engage while the other channel continues operating.
Row Power-powered systems can exhibit excessive hum, buzz, or supply-related noise when the power system, grounding, distribution connection, or attached load is abnormal. Power problems can also interfere with startup and firmware-loading behavior on sensitive digital modules.
Heavily used 4ms modules employ numerous PCB-mounted potentiometers, sliders, illuminated buttons, rotary encoders, switches, and 3.5 mm jacks that can eventually become intermittent or mechanically worn. Symptoms include jumping parameter values, controls that respond only in certain positions, unreliable triggering, or intermittent audio/CV connections.
4ms DIY versions of the PEG, RCD, SCM, Sampler, Looping Delay, Swash, and related products commonly develop faults when solder joints, IC orientation, diodes, headers, jumpers, or polarized capacitors are installed incorrectly. Typical symptoms are no power, dead channels, missing controls, unstable operation, or sections of the circuit failing completely.
Connect with a technician.
Orders can typically be cancelled 24 hours prior to shipping
Get a real-time offer. Enter the make and model to begin.
Acme offers several ways to pay your service or repair balance.
Securely powered by 
This service is provided by Community Federal Savings Bank (“CFSB”), member FDIC, for which GoCardless Ltd acts as a third-party servicer.
Payable to ACME REVIVAL INC, write 4ms in memo line, and mail your check to: 191 University Blvd. Suite 340, Denver, CO 80206. Payment are collected every weekday excluding federal holidays.
