alm-busy-circuits/mfx

MFX

ALM Busy Circuits

The MFX is a compact 6HP Eurorack stereo digital audio multi effects processor. It offers 17 different full featured effects programs plus a number of metering utilities.282

Capabilities 1

Stereo Effects Processorstereo-effects-processor
17 effects programs plus utilities; 16-bit/44.1kHz stereo DSP processing.282

Jacks 8 (6 in / 2 out)

NameSignalVoltageDescription
Inputs (6)
CV1cv0V to 5V282
CV2cv0V to 5V282
CV3cv0V to 5V282
Clkclock—282
Left Inaudio—282
Right Inaudio—282
Outputs (2)
Left Outaudio—282
Right Outaudio—282

Parameters 122

NameTypeRangeBehavior
Attack (TY-50 Dynamics)menu_setting—In compression mode: time for gain to be fully reduced after crossing threshold. In shaper mode: shortens or lessens attack transients.282
Bandwidthmenu_setting—Sets the sampling frequency of the delay line. Doubles delay time with each step down.282
Base Freqmenu_setting—Sets the frequency of the lowest bandpass filter. Shifts all bands together with respect to the Ratio setting.282
Bit Depth (2051 Bit Corrupter)menu_setting—Sets the bit depth of the dry signal.282
Bit Depth (Digi-PCM Echo)menu_setting—Sets the bit depth of the delay line.282
Brightnessmenu_setting—Changes timbre of the spring sound.282
Buffer Sizemenu_setting1ms – 1000msSets the size of the buffer in ms when clock is internal. Ranges from 1-1000ms (Mono) and 1-500ms (Stereo and Dual modes).282
Burstmenu_setting—Enables a burst of grains triggered by the Clk input.282
Clock (2051 Bit Corrupter)menu_setting—Sets if the buffer size is based on internal (INT) or external (EXT) clock.282
Clock (Digi-PCM Echo)menu_setting—Sets if the delay time is based on internal (INT) or external (EXT) clock.282
Clock (Tape-Tech Echo)menu_setting—Sets if the delay time is based on internal (INT) or external (EXT) clock.282
Clock Mult (2051 Bit Corrupter)menu_setting—Sets the buffer length as a multiple of the incoming clock pulse when clock is set to external.282
Clock Mult (Digi-PCM Echo)menu_setting—Sets the buffer length as a multiple of the incoming clock pulse when Clock is set to external.282
Clock Mult (Tape-Tech Echo)menu_setting—Sets the buffer length as a multiple of the incoming clock pulse when Clock is set to external.282
Cutoffmenu_setting20Hz – 20000HzSets the cutoff of the filter. Ranges from 20Hz to 20kHz.282
Damping (Almicon Reverb)menu_setting—Darkens the reverb tail, both shortening its length and reducing high frequencies.282
Damping (Quaidra Reverb)menu_setting—Darkens the reverb tail, both shortening its length and reducing high frequencies.282
Damping (Slinky Reverb)menu_setting—Sets the amount of feedback into the spring. Lower values equal longer, more resonant decays.282
Damping (Yetti Reverb)menu_setting—Darkens the reverb tail, both shortening its length and reducing high frequencies.282
Densitymenu_setting—Sets the number of grains.282
Depth (Ensembles Ensemble)menu_setting—Sets the depth of modulation.282
Depth (Multi Phaser)menu_setting—Sets how pronounced the notches are (depth of the phasing effect).282
Diffusionmenu_setting—Reduces or increases the uniformity of the reverb tail, causing reflections to appear more distinct or thicker.282
Drive (TH-30 Distortion)menu_setting—Sets the amount of drive into the selected distortion type.282
Env Follow (Freq Shifter)menu_setting—Enables envelope following to control the dynamics of the frequency shifted signal. Frequency Shifter mode only.282
Era (Almicon Reverb)menu_setting—Toggles the quality of the underlying reverb algorithm: '80s' uses lower bit depth with grainy sound and poor clipping resilience; 'NOW' has much higher resolution and improved saturation.282
Era (Quaidra Reverb)menu_setting—Toggles algorithm quality: '90s' uses lower bit depth with grainy sound and poor clipping resilience; 'NOW' has higher resolution and improved saturation.282
Fade Inmenu_setting—Applies a smoothing envelope to the attack and decay of repeats in the buffer.282
FB Combmenu_setting—Sets the position of the comb filter effect caused by the feedback control.282
Feedback (Crumbular Echo)menu_setting—Sets the amount of feedback into the delay buffer.282
Feedback (Multi Phaser)menu_setting—Sets the amount of feedback, narrowing the shape of the notches as it is increased.282
Feedback (Tape-Tech Echo)menu_setting—Sets the amount of feedback into the delay buffer.282
Feedback (Ursa Minor Echoverb)menu_setting—Sets the amount of feedback into the delay buffer.282
Filter Modemenu_setting—Selects the filter type: no filtering, low pass, high pass, or band pass.282
Flip Phasemenu_setting—Inverts the phase of the delay line.282
Freeze (Pocket PL8 Reverb)menu_setting—When enabled, reverb tail decay is disabled and the reverb is frozen. A trigger at the Clk input will refreeze.282
High Cut (Crumbular Echo)menu_setting—Sets the cutoff frequency of a low-pass filter in the delay line.282
High Cut (Digi-PCM Echo)menu_setting—Sets the cutoff frequency of a low-pass filter in the delay line.282
High Cut (Freq Shifter)menu_setting—Sets the cutoff frequency of a low-pass filter on the wet signal. Frequency Shifter mode only.282
High Cut (Ursa Minor Echoverb)menu_setting—Sets the cutoff frequency of a low-pass filter in the delay line.282
High Cut (Yetti Reverb)menu_setting—Sets the cutoff frequency of a low-pass filter after the reverb tail.282
Length (Slinky Reverb)menu_setting—Sets the length of the spring and therefore the overall size of the reverb. High values reach more into echo territory.282
Lock Inmenu_setting—Loops playback of the buffer, even if there is no audio in it.282
Loopmenu_setting—Loops the currently stored delay buffer.282
Low Cut (Crumbular Echo)menu_setting—Sets the cutoff frequency of a high-pass filter in the delay line.282
Low Cut (Quaidra Reverb)menu_setting—Sets the cutoff frequency of a high-pass filter on the reverb tail.282
Low Cut (Ursa Minor Echoverb)menu_setting—Sets the cutoff frequency of a high-pass filter in the delay line.282
Low Cut (Yetti Reverb)menu_setting—Sets the cutoff frequency of a high-pass filter after the reverb tail.282
Make Up Gainmenu_setting—Sets the final output gain of the compressed or shaped signal.282
Max Frequencymenu_setting—Sets the maximum frequency that bands can reach before being reflected.282
Max Repeatsmenu_setting≤10Maximum number of repeats that may occur with every glitch, up to 10.282
Mixmenu_setting0% – 100%Sets the wet/dry blend. At 0% only the dry input is heard; at 100% only the wet effect signal is heard. Can be globally disabled and locked to 100% wet via the Utilities program.282
Mix Typemenu_setting—PRE: applies Bit Depth and Sample Rate reduction pre-mix to both dry and wet signals. PST: applies reduction post-mix to wet signal only.282
Mod Clockmenu_setting—Sets if the modulation rate is based on internal (INT) or external (EXT) clock.282
Mod Depth (Digi-PCM Echo)menu_setting—Sets the depth of modulation over the delay time.282
Mod Rate (Digi-PCM Echo)menu_setting—Sets the rate of modulation over the delay time.282
Mod Rate (Ensembles Ensemble)menu_setting—Sets the modulation speed. Only visible if supported by the selected mode.282
Mod Rate (Modulating Panner)menu_setting0.05Hz – 8HzSets the rate of modulation in Hz when clock is set to internal. Ranges from 0.05-8Hz.282
Mod Rate (Multi Phaser)menu_setting—Sets the modulation rate of the phasing.282
Mode (2051 Bit Corrupter)menu_setting—Sets the I/O mode: Mono (mono in/out, max 1000ms buffer), Stereo (stereo in/out, same random seed, max 500ms), Dual (stereo in/out, different random seeds per side, max 500ms).282
Mode (Crumbular Echo)menu_setting—Sets the mode to either mono or stereo.282
Mode (Digi-PCM Echo)menu_setting—Sets the delay mode: Mono Delay (single delay line, mono out), Dual Tap (pair of lines mixed to mono), Stereo Tap (pair of lines hard-panned), Ping Pong (swap sides each repeat), Ext Feedback (single mono delay using only left in/out; right output is send, right input is return).282
Mode (Ensembles Ensemble)menu_setting—Selects the chorus or ensemble mode: Juno I, Juno II + I, Alpha, RS I, RS II, Solina (mono), Wide, Vibrato.282
Mode (Modulating Panner)menu_setting—Sets the mode: Mono (pans left input between L and R outputs) or Scan (cross fades between left and right inputs to mono output).282
Mode (Multi Phaser)menu_setting—Sets the mode: Mono (mono in/out, up to 8 stages), Stereo (stereo in/out, up to 4 stages), Infinite Up (mono upward barber-pole, up to 4 stages), Infinite Down (mono downward barber-pole, up to 4 stages).282
Mode (Ring + Freq Modulator)menu_setting—Sets the mode to either ring modulation or frequency shifter.282
Mode (Squoval Rezonator)menu_setting—Sets the mode: Mono (mono in/out, up to 8 parallel filters) or Stereo (stereo in/out, up to 4 parallel filters per side).282
Mode (TY-50 Dynamics)menu_setting—Sets the dynamics processing mode: Stereo Compressor, Sidechain in R, Transient Shaper, or Stereo Expander.282
Mode (Ursa Minor Echoverb)menu_setting—Selects between reverb or echo modes.282
Modulator (Ring Mod)menu_setting—Selects between the internal modulation oscillator (INT) or external source (LxR). LxR mode expects carrier at left input and modulator at right, outputting in mono.282
Num Activemenu_setting1 – 8Sets the number of active bands: 1-8 (mono) or 1-4 (stereo).282
Osc Rate (Ring Mod)menu_setting20Hz – 11000HzSets the rate in Hz of the internal modulation oscillator. Ranges from 20Hz-11kHz.282
Output Gain (TH-30 Distortion)menu_setting—Reduces the final output of the distorted signal.282
Pitch Destinationmenu_setting—Routes the pitch shifter to either the delay's Feedback path or the Input signal.282
Pitch Shift (Ensembles Ensemble)menu_setting—Shifts the pitch of the incoming signal without affecting its time.282
Pitch Shift (Tape-Tech Echo)menu_setting—Shifts the pitch of the delay line without affecting the time.282
Pitch Shift (Yetti Reverb)menu_setting—282
Play Headsmenu_setting—Sets the number of tape read heads for the echo density. The middle head is less stable than the outer ones.282
Pre-Delay (Almicon Reverb)menu_setting0ms – 99msDelays the onset of the reverb tail. Ranges from 0-99ms.282
Pre-Delay (Pocket PL8 Reverb)menu_setting0ms – 99msDelays the onset of the reverb tail. Ranges from 0-99ms.282
Pre-Delay (Yetti Reverb)menu_setting0ms – 100msDelays the onset of the reverb tail. Ranges from 0-100ms.282
Program (Ursa Minor Echoverb)menu_setting—Selects one of 20 different time arrangements for the 8 delay taps (4 left, 4 right).282
Ratiomenu_setting—Sets the amount of gain reduction applied to the signal when it crosses the threshold. Compression mode only.282
Ratio (Squoval Rezonator)menu_setting—Sets the ratio between each filter's frequency in relation to the previous band.282
Recyclemenu_setting—When enabled all grains are added to the feedback path for a more diffused sound; otherwise just a single tap is used for feedback.282
Reflectsmenu_setting—Enables reflecting of any bands that cross the Max Frequency threshold.282
Regen (Digi-PCM Echo)menu_setting—Sets the amount of feedback into the delay buffer.282
Release (TY-50 Dynamics)menu_setting—In compression mode: time to return to original level after being reduced. In shaper mode: shortens or lessens release transients.282
Resonance (Modulating Panner)menu_setting—Sets the amount of filter resonance.282
Resonance (Squoval Rezonator)menu_setting—Sets the amount of resonance for all active bands.282
Reverse (2051 Bit Corrupter)menu_setting—Reverses playback of the buffer.282
Reverse (Digi-PCM Echo)menu_setting—Reverses playback of the delay buffer.282
Reverse (Pocket PL8 Reverb)menu_setting—Reverses the reverb tail.282
Sample Rate (2051 Bit Corrupter)menu_setting—Sets the sample rate of the dry signal.282
Shapemenu_setting—Sets the envelope shape of the grains.282
Shift (Freq Shifter)menu_setting0Hz – 1000HzChanges the frequency of the incoming signal in Hz. Ranges from 0Hz-1kHz. Frequency Shifter mode only.282
Size (Almicon Reverb)menu_setting—Sets the size/time of the reverb tail.282
Size (Pocket PL8 Reverb)menu_setting—Sets the size/time of the reverb tail.282
Size (Quaidra Reverb)menu_setting—Sets the size/time of the reverb tail.282
Size (Yetti Reverb)menu_setting—Sets the size/time of the reverb tail.282
Spraymenu_setting—Randomly varies the size of the grains.282
Spread (Multi Phaser)menu_setting—Sets the width of the stereo image. Only applies to stereo mode.282
Stagesmenu_setting2 – 8Sets the number of notches ranging from 2-8 (mono) or 2-4 (stereo).282
Stereo (Pocket PL8 Reverb)menu_setting—Widens the reverb to faux stereo via phase inversion. Includes settings for mild and full widening. When set to off, reverb is mono.282
Stereo (Squoval Rezonator)menu_setting—Shifts the frequency of the bands on right and left up and down respectively to create width. Only available in Stereo mode.282
Tap Level 1menu_setting—Sets the level of the first tap panned left and the first tap panned right.282
Tap Level 2menu_setting—Sets the level of the second tap panned left and the second tap panned right.282
Tap Level 3menu_setting—Sets the level of the third tap panned left and the third tap panned right.282
Tap Level 4menu_setting—Sets the level of the fourth tap panned left and the fourth tap panned right.282
Tap Multmenu_setting—Sets the time of the second tap as a multiple of the main time. Not used in Mono and Ext Feedback modes.282
Tape Agemenu_setting—Sets the age of the tape: increases noise, saturation, drop outs and darkness in the repeats.282
Thresholdmenu_setting—Sets the amplitude at which the compressor begins to take effect. Compression mode only.282
Tightnessmenu_setting—Simulates a tighter physical plate dampening the reverb.282
Tilt Filter (TH-30 Distortion)menu_setting—Tilt-style EQ filter applied to the distorted signal, emphasising either high or low frequencies. Wide-ranging.282
Tilt Filter (TY-50 Dynamics)menu_setting—Tilt style EQ filter that sets the region of frequencies detected by the envelope followers. Transient Shaper mode only.282
Time (Crumbular Echo)menu_setting50ms – 999msSets the length of the delay buffer in ms. Ranges from 50-999ms.282
Time (Digi-PCM Echo)menu_setting0ms – 998msSets the length of the delay buffer in ms when Clock is set to internal. Ranges from 0-998ms x8.282
Time (Tape-Tech Echo)menu_setting0ms – 998msSets the length of the delay buffer in ms. Ranges from 0-998ms.282
Time (Ursa Minor Echoverb)menu_setting0ms – 254msSets the length of the delay buffer. Only applies to echo mode. Ranges from 0-254ms.282
Type (TH-30 Distortion)menu_setting—Sets the type of distortion. Options: Soft (analog-style soft clipping, rounds transients), Saturate (clipping with compressed harmonics), Overdrive (clipped signal introduces harsher harmonics), Digital (digital hard clipping, squares off transients), Wavefold (the digital wavefolder from the Tyso Daiko), Nuclear (maximum clipping — squares off all incoming transients), Warm (tube-style distortion).282
Wide (Slinky Reverb)menu_setting—Adds a stereo widening effect to the reverb.282
Wow + Fluttermenu_setting—Introduces slight changes to the delay time, adding pitch warble and chorusing to the repeats.282

Firmware history 16 versions

VersionReleasedNotes
115—Added Stereo Expander mode to TY-50 Dynamics; Mix control enabled for Transient Shaper and Sidechain In R modes; Added Fade In parameter to Bit Corrupter; Added FB Comb parameter to Multi Phaser.282
114—Improved filter in Modulating Panner and resonators in Squoval Rezonator; fixed Digi-PCM clocking bug; more preset lockup fixes.282
113—Fixed potential noise on some reverbs when bypassed; fixed Clock utility response; fixed potential lockups on some presets.282
112—Skipped for Eurorack module; pedal only release.282
111—Overhauled Crumbular engine; added Recycle and Shape parameters to Crumbular; added visualizations for Spray and Density; Ensemble Mod Rate made CV-able; added Wide mode to Slinky Reverb; added Warm distortion type to TH-30.282
110—Added Preset Loader screen; merged Transient Shaper and Compressor into TY-50 Dynamics; added stereo Ensembles modes (Vibrato, Rotary, Alpha); improved Tape Echo tape aging and wow/flutter; improved Pre-Delay on Pocket PL8, Almicon and Yetti reverbs.282
109—Fixed Axon UI slowdown bug.282
108—Added Slinky spring reverb engine; added high-res modern Quaidra and Almicon reverb implementations; added shared global user presets (no longer limited to 2 per effect); spectrum analyser improvements.282
107—Added spectrum analyser to Utilities; added Freeze, Reverse, and Tightness parameters to PL8 Reverb; fixed test tone, Bit Corrupter and Digi Delay initialisation bugs.282
106—Added Squoval Resonator FX engine; added Infinite Up/Down modes to Multi Phaser; added Mix Type PRE/PST parameter to Bit Corrupter; added new static presets to most engines; fixed preset parameter loading bug.282
105—All reverbs (except PL8) now perform wet/dry mix preserving stereo input; Crumbular stereo final mix fixed; improved clocking accuracy; fixed preset parameter loading; added Axon-2 support (tap tempo, toggle passthrough).282
104—Introduced MFX VCV Rack version; fixed Bit Corrupter lockup with ext clock in stereo; fixed INT/EXT buffer update bug; improved Tape Delay external clocking stability; fixed Axon CV assignment save across power cycles; added Mumdance presets.282
103—Added Yetti FDN Reverb and Multi Phaser engines; reworked Crumbular Echo with longer time and variance parameter; added state variable filter to Modulating Panner; added sidechain mode and stereo/dual modes to Bit Corrupter; added 440Hz test tone to Utilities; improved headroom for Quaidra and Almicon reverbs.282
102—Added global wet/dry mix lock to Utilities (100% wet); added envelope follower toggle to Frequency Shifter; added clock metering to Utilities; fixed Frequency Shifter param names; summed L+R inputs on Ursa Minor; various bug fixes.282
101—Fixed CV handling range; added pitch shifter destination toggle on Tape Delay; disabled CV on some reverb pre-delays to avoid lockup; fixed EXT/INT clock switching with CV; fixed Almicon pre-delay; summed L+R inputs on Crumbular, Tape Delay and reverbs. (Odd versions considered beta releases.)282
100—Initial release firmware.282

References 2

  1. [282]
    ALM-032 'MFX' Manual v0.9 (firmware v115)manual
    ● verified 2026-05-06
  2. [283]
    ALM MFX product pageproduct_page
    ⚠ verified 2026-05-06 · manufacturer changed since last verified