jomox/modbase-09

MOD Base 09

JoMoX

Analog kick drum synthesizer Eurorack module with eight panel potentiometers, CV/Gate and MIDI control, two internal LFOs, metallic noise generators, and 100 storable presets.954

Capabilities 3

Bass Drum / Kick Drum Voicebass-drum
Fully analog kick drum voice in the TR-909 lineage with VCO, pitch envelope, harmonics shaping, noise attack section, and two LFOs.954
MIDI to CVmidi-to-cv
All sound parameters controllable via MIDI CCs; module receives and transmits note on/off, program change, and controllers on a configurable MIDI channel.954
Preset Storagepreset-storage
Stores up to 100 presets recallable via encoder; all sound parameters are stored per preset and transferable via MIDI SysEx.954

Jacks 8 (7 in / 1 out)

NameSignalVoltageDescription
Inputs (7)
CV1cv0V to 5VAssignable CV input that can modulate internal sound parameters; amount and destination programmable per CV.954
Assignable destinations
Tune Envelope954 Bass Drum Pitch954 Decay954 Harmonics954 Pulse954 Noise954 Attack954 EQ-Filter954 Compression954 Metallic Noise 1954 Metallic Noise 2954 LFO 1 Rate954 LFO 1 Intensity954 LFO 2 Rate954 LFO 2 Intensity954 AccentAccent destination available on CV1 only.954
CV2cv0V to 5V954
CV3cv0V to 5V954
CV4cv0V to 5V954
Gategate0V to 15VGate input that triggers the kick drum without velocity sensitivity; threshold ~1V, polarity software-invertible, supports S-trig mode.954
LIN.FMcvPurely analog linear FM input for the kick drum VCO; accepts negative voltages, works over the full audio range, no software amount control.954
TriggermixedAnalog trigger input for drumpad piezo pickups or audio signals; supports velocity/dynamics, threshold and dynamics adjustable in software.954
Outputs (1)
OutaudioUnbalanced audio output with up to +20 dBu maximum level; may overdrive high-gain inputs.954

Parameters 30

NameTypeRangeBehavior
Attackknob0 – 252Master level of the mixed pulse-and-noise attack section; setting to zero mutes both pulse and noise components entirely.954
Bus Sendmenu_setting0 – 255954
Bus Volmenu_setting0 – 255954
Compressionmenu_setting0 – 255Compresses the decay envelope; at high values the kick becomes very short and clicky, useful for adapting the body of the kick to a mix.954
CV 1-4 Amountmenu_setting-128 – 127Sets the CV modulation scaling; negative values subtract the CV from the destination parameter. Multiple CVs can be routed to the same destination and their amounts sum.954
CV 1-4 Destinationmenu_setting954
Decayknob0s – 252sControls the length of the kick drum's decay phase.954
EQknob0 – 252Lowpass filter on the kick drum output; fully open at 0, fully closed at 252. Higher values produce soft, sinusoid 808-style kicks; lower values give heavy, punchy sounds.954
Gate Modemenu_settingSelects gate polarity: PoS (positive, default) triggers on rising edge; neg inverts triggering; Str enables switch-trigger mode for open-collector/mechanical switch sources.954
Gate Timemenu_setting0ms – 255msSets the impulse length of the internal trigger pulse sent to the analog circuitry; shorter times add high-frequency attack content but less energy; strongly affects pulse, noise, and attack character.954
Harmonicsknob0 – 252Shapes the VCO waveform from near-sinusoid toward a parabolic waveform, adding upper harmonics for a harder, timpani-like character without simple distortion.954
LFO 1 Destinationmenu_settingSelects whether LFO 1 modulates the kick drum VCO pitch (default) or metallic noise 1.954
LFO 1 Intensityknob0 – 252Sets the modulation depth of LFO 1; zero disables LFO 1 modulation entirely.954
LFO 1 Speedknob0 – 252Controls the frequency of LFO 1 modulation; low value is slow, high value is fast. Phase restarts with each gate trigger.954
LFO 1 WaveknobSelects the waveform for LFO 1; LFO 1 always modulates the kick drum VCO pitch and restarts phase on each gate trigger, acting like an additional pitch envelope.954
LFO 2 Intensitymenu_setting0 – 127954
LFO 2 Speedmenu_setting0 – 127954
LFO 2 WaveknobSelects the waveform for LFO 2, which modulates the kick drum VCO pitch. Same waveform options as LFO 1.954
Met Nze 1menu_setting0 – 499Metallic noise generator 1; off disables it, noi gives white noise, values 2–499 produce unique digital multitone/bit-pattern signals. Yields more aperiodic, noise-like sounds than MetNze 2. Audible only during gate period.954
Met Nze 2menu_setting0 – 499Metallic noise generator 2 with a more periodic, tonal character; its timbre is further shaped by the MetNze 2 bit mask parameter. Both generators are mixed by hardware.954
Met Nze 2 Bit Maskmenu_setting0 – 15Defines the bit mask applied to metallic noise generator 2; small values produce high-frequency tones, large values yield longer periodic patterns.954
Midi Channelmenu_setting1 – 16Sets the MIDI channel for both reception and transmission of note on/off, program change, and controller messages.954
Noiseknob0 – 252Controls the noise component level in the attack; higher EQ values reduce audibility of noise. Interacts with MetNze parameters which can add metallic character to the noise signal.954
Pitchknob0Hz – 252HzSets the base frequency of the kick drum VCO; the resting pitch after the tune envelope decays. Covers sub-bass frequencies down to 10 Hz.954
Pulseknob0 – 252Sets the level of the pulse component in the attack section; gate time also affects this parameter.954
Split Modemenu_settingConfigures how MIDI note numbers map to the kick drum pitch across five selectable note-range modes, from single-note GM standard to full keyboard-spread.954
Trig Dynamicsmenu_setting1 – 63Scales incoming TRIG velocity; low value flattens dynamics to uniform loudness, high value enables maximum velocity sensitivity.954
Trig Sensmenu_setting1 – 99Sets the threshold level for TRIG input triggering; LED column serves as VU meter when this menu is active.954
Tuneknob0 – 252Controls the depth of the pitch envelope applied to the VCO at attack onset; higher values produce the classic 909 kick punch, lower values give softer 808-style bass tones.954
Volumemenu_setting0 – 255Sets the main output volume; maximum MIDI velocity maps to this level. Best sonic results at maximum (255).954

Firmware history 1 version

VersionReleasedNotes
1.0954

References 2

  1. [954]
    JoMoX MOD Base 09 User Manualmanual
    verified 2026-05-24
  2. [955]
    JoMoX MOD Base 09 product pageproduct_page
    verified 2026-05-24