It´s a quad LFO with four free running triangle LFOs.
Each of the LFOs got a jumper on the backside for setting one of two ranges.
The lowest range cycles around 41 seconds, the highest into FM.
4HP
Depth: 35mm
+12V 33mA
-12V 33mA
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Synthesizer Goodies & Music Production
4FO – Simple Quad LFO for Eurorack Synthesizer
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