Available as an assembled Module and as a DIY project.
This Module is currently available.
barton bmc031 quad trap lfo
This module is a specialized LFO. It outputs four trapezoidal waveforms which are synchronized with each other. Each of the four knobs adjusts the duration of a different phase of each output. It requires no special parts to build.
https://synthcube.com/cart/michael-barton-en/barton-bmc031-quad-trap-lfo
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These merchants probably sell this module. Huh?