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4ms MESA Reverb Module For Eurorack Systems

8 May, 2026 Hardware Effects, Synthesizers/Keyboard Synthesizers & Modular Synthesizers

Ahead of Superbooth 2026, 4MS Company has introduced MESA, high-fidelity reverb module, created in collaboration with Valley Audio.Running at 96 kHz with 64-bit double-precision processing, Mesa is “among the finest-sounding reverbs available at any price point”, according to 4ms.

The four modulation LFOs, pre-delay buffer, dual filters, and vast reverb network open the door to subtle chorusing, plucked strings, pitched echoes, swirling textures, and deep ventures into “genuinely alien sonic territory”.

Features:

Stereo Inputs and Outputs
Freeze: holds the reverberations forever. Button can be set to momentary or toggle/latch
Clear: clears the buffer, canceling all existing reverb and letting new echoes build up. Useful for gated reverbs or purging chaos
Size: Sets the overall delay time and apparent size of the reverb. Ranges from very short to extremely long.
Tuned Size button: Shortens the delay times and tunes the all-pass filters to an exponential response so that the reverb can be played with 1V/oct sources
Diffusion: Controls how diffused and smeared the reverb is. No diffusion results in audible echoes like in a delay effect
Diffuse Input: Engages the input diffusion stage that pre-diffuses and smears the signal before reverberation. Bypassing the stage sharpens the input signal.
Decay: Sets the speed at which the signal decays over time. The maximum setting results in a long reverb that evolves over time into a very slowly dying cloud of sound.
Pre-Delay: Determines the delay for when the original signal is fed into the reverberator. Ranges from 0 to 500ms.
Input Filter: Filters the incoming signal from low-pass to flat to high-pass
Reverb Filter: Filters the reverberations from low-pass to flat to high-pass
Dry/Wet: Control the mix of the original and reverberant signals. Reverb clipping light flashes when clipping at this stage.
Input Level: Boost/cut the input from -? to +3 dB. Input clipping light flashes red when clipping at this stage.
Mod Depth: Amount of modulation to apply to the left and right delay sections via the four modulation LFOs
Mod Rate: Speed of the modulation. Each of the four LFO’s speed is offset from the others
Mod Shape: Shape of the modulation LFOs. From rising sawtooth, to triangle, to falling ramp.