Doepfer A-145-4 Quad LFO
Four independent LFOs with waveform outputs and range switching
4 HP Eurorack module
The A-145-4 is a quad LFO module for the Doepfer A-100 Eurorack system, providing four independent low-frequency oscillators each with sine, triangle, and square wave outputs. Each LFO features a jumper-selectable frequency range for either slow modulation duties or faster audio-rate-adjacent cycling, making it a versatile and compact multi-source modulation workhorse.
Features
- Four independent LFO channels
- Each LFO provides sine, triangle, and square waveform outputs simultaneously
- Per-LFO jumper-selectable frequency range: low range ~2 Hz to 0.004 Hz (4 min period) or high range ~50 Hz to 0.1 Hz (10 sec period)
- Individual activity LED per LFO for visual monitoring of oscillation
- Individual frequency knob per LFO
- Jumpers JP3, JP4, JP5, JP6 control frequency range for LFO 1, 2, 3, 4 respectively
- Compact Eurorack format providing four simultaneous modulation sources
Controls & Jacks (20)
- LFO 1 Square Output — Square wave output of LFO 1
- LFO 1 Frequency — Sets the frequency of LFO 1. Range depends on JP3 jumper position.
- LFO 2 Sine Output — Sine wave output of LFO 2
- LFO 1 Sine Output — Sine wave output of LFO 1
- LFO 2 Frequency — Sets the frequency of LFO 2. Range depends on JP4 jumper position.
- LFO 2 Triangle Output — Triangle wave output of LFO 2
- LFO 2 Square Output — Square wave output of LFO 2
- LFO 3 Frequency — Sets the frequency of LFO 3. Range depends on JP5 jumper position.
- LFO 4 Frequency — Sets the frequency of LFO 4. Range depends on JP6 jumper position.
- LFO 3 Sine Output — Sine wave output of LFO 3
- LFO 1 Triangle Output — Triangle wave output of LFO 1
- LFO 3 Triangle Output — Triangle wave output of LFO 3
- LFO 1 Activity — Visual indicator of LFO 1 oscillation
- LFO 2 Activity — Visual indicator of LFO 2 oscillation
- LFO 3 Activity — Visual indicator of LFO 3 oscillation
- LFO 3 Square Output — Square wave output of LFO 3
- LFO 4 Sine Output — Sine wave output of LFO 4
- LFO 4 Triangle Output — Triangle wave output of LFO 4
- LFO 4 Square Output — Square wave output of LFO 4
- LFO 4 Activity — Visual indicator of LFO 4 oscillation
How-To Guides
- Slow Ambient Pad Modulation
- Quad Tremolo Choir
- Generative Gate Patterns
- Independent Vibrato Per Voice
- Automated Filter Sweep Layers
- Pulsing Bass Modulation
- Pseudo-Random Stepped Modulation
- LFO-Driven Percussion Sounds
Explore the interactive A-145-4 Quad LFO panel on BleepDex — tap any control to learn what it does.
