Available as an assembled Module and as a DIY project.
This Module is currently available.
ANALOG SKEW-ABLE XFADE-ABLE LFO
The Skew-Fade LFO is a 3hp all analog low frequency oscillator capable of a plethora of waveforms. It has three rate settings ranging from 3 minutes and 30 seconds a cycle up to audio range at 20 hz. Triangle waves can be skewed between ramps and saws, and square waves pulse width can be adjusted from inverted triggers to triggers. The LFO’s unique feature is voltage controlled cross fading through the (“Fade C.V.” in) between square/shark tooth\sine waveforms provided at the “Fade Out.” All outs are also influenced by the skew knob resulting in many complicated and asymmetrical possibilities at the “Fade Out.” It can even be self patched(ie triangle or square into fade cv) for an extended pallet of waveforms. The “Fade C.V.” in expects a bipolar voltage 10vpp to fade from square to sine with the fade pot at noon position. Bicolor led provides constant display of positive and negative voltage crossings.
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These merchants probably sell this module. Huh?