Eurorack Reference / modules /4ms/quad-pingable-lfo audit site v0.1 — milestone 3
4ms/quad-pingable-lfo

Quad Pingable LFO

4ms

Compact, playable four-channel tap-tempo, pingable (clock-syncable) LFO with variable skew and reset. Each channel's speed is set by a Tap Tempo button or an external clock. Each channel can be Muted and Reset with an external trigger.379

Capabilities 3

Clock Sourceclock-source
Any channel can serve as a master clock by setting Skew to 0% to produce a trigger/pulse output.379
LFOlfo
Four independent pingable LFO channels with variable skew waveshape (trigger to pluck to ramp-down to triangle to ramp-up), tap tempo or external clock sync, mute, and reset per channel.379
Tap Tempotap-tempo
Each channel has an independent tap tempo button for manually setting the LFO period.379

Jacks 4 — 3 in / 1 out

NameSignalVoltageDescription
Inputs (3)
PingclockSets tempo with an external clock; any signal can be used for triggering. Overrides internal tap-tempo when signal is present.379
ResettriggerRestarts the LFO without changing the tempo; rising edge triggered. Also enables one-shot mode and floating reset mode.379
Skew CVcv0V to 10VCV input that controls waveshape by altering the ratio between rise and fall times. Full range is 10V; knob provides offset.379
Outputs (1)
OUTcvOutputs LFO waveshape; either 0 to 10V (unipolar) or -5V to +5V (bipolar) depending on jumper setting.379

Parameters 5

NameTypeRangeBehavior
Bipolar/Unipolar JumperjumperSelects output voltage range: Bipolar (-5V to +5V) or Unipolar (0V to +10V). One jumper controls all four channels. Factory default is Unipolar.379
Fire On Unmute JumperjumperWhen installed, pressing On button fires a reset pulse, restarting the waveform. Each channel has its own jumper. Factory default is no jumpers (all off).379
On/Mute ButtonbuttonLatching button that enables or mutes the channel output. Lights up orange when channel is on. LFO continues running in background when muted (unless Fire-on-Unmute jumper is installed).379
Ping ButtonbuttonTap twice to set tempo; button flashes to internal tap-tempo clock or to incoming pulses on Ping jack. Tap-Tap-Hold (hold 2 seconds) stops the internal clock to arm one-shot mode.379
Skewknob0% – 100%Controls waveshape by altering the ratio between rise and fall times. At 0%: 10ms trigger pulse. Just above 0%: near-exponential pluck/ramp-down. At 50%: triangle wave. At 100%: ramp-up. Knob provides offset to incoming CV.379

Firmware history 1 version

VersionReleasedNotes
1.02013-04-25379

References 2

  1. [379]
    Quad Pingable LFO User Manualmanual
    verified 2026-05-15
  2. [380]
    4ms Company Quad Pingable LFO product pageproduct_page
    verified 2026-05-15