Vostok Instruments Halo
Quad LFO with logic — 16 simultaneous modulators in 10HP.
10 HP Eurorack module
Halo is a compact quad LFO designed to pack a huge amount of modulation into 10HP. Each of the four channels delivers an independent triangle and square output at rates from sub-audio (0.008 Hz, ~2 minutes per cycle) up to 80 Hz, with bipolar 10Vpp CV input that sums with the FREQ knob. A two-section analog logic block then processes channel pairs (1–2 and 3–4): each pair gets AND, OR, XOR, and MIX outputs derived from whichever waveform (triangle or square) each channel sends into the logic section. Result: 16 simultaneous modulation signals from one 10HP module.
Features
- Four independent analog LFO channels in 10HP
- Frequency range from 0.008 Hz (~2 min) to 80 Hz
- Two-position LO/HI range switch per channel
- Simultaneous triangle and square outputs per channel
- Bipolar 10Vpp FREQ CV input per channel
- FREQ CV is normalled down the chain — one CV controls all four channels
- Two analog logic sections (one per channel pair 1-2 and 3-4)
- AND output — minimum/lower of the pair (downward modulation patterns)
- OR output — maximum/higher of the pair (upward modulation patterns)
- XOR output — unipolar 0-10V difference (great for gate-like patterns)
- MIX output — analog sum of both channel waveforms
- Per-channel logic waveform select (triangle or square into logic)
Controls & Jacks (36)
- Ch 1 FREQ
- Ch 1 Range
- Ch 1 Logic Select
- Ch 1 LED
- Ch 2 Range
- Ch 2 Logic Select
- Ch 2 LED
- Ch 3 Range
- Ch 3 Logic Select
- Ch 3 LED
- Ch 4 Range
- Ch 4 Logic Select
- Ch 4 LED
- Ch 1 Triangle Out
- Ch 1 Square Out
- FREQ CV 1 In
- FREQ CV 2 In
- Ch 2 Square Out
- Ch 2 Triangle Out
- Ch 2 FREQ
- FREQ CV 3 In
- Ch 3 Triangle Out
- Ch 3 Square Out
- Ch 3 FREQ
- FREQ CV 4 In
- Ch 4 Triangle Out
- Ch 4 Square Out
- Ch 4 FREQ
- Logic 1-2 AND Out
- Logic 1-2 MIX Out
- Logic 1-2 OR Out
- Logic 1-2 XOR Out
- Logic 3-4 AND Out
- Logic 3-4 MIX Out
- Logic 3-4 OR Out
- Logic 3-4 XOR Out
How-To Guides
- Warm Filter Sweep
- AND/OR Rhythm From Two Square LFOs
- One CV Drives All Four Channels
- XOR for Generative Gate Density
- Stereo Random Motion From MIX Outputs
Explore the interactive Halo panel on BleepDex — tap any control to learn what it does.
