The Marsling Octafuzzdrive is a recreation of the fOXX Tone Machine, first released in 1971 and discontinued in 1978. The Tone Machine is a thick fuzz that uses a phase splitter and complementary rectifier to create an octave overtone.
Demo by Guitar World (EN)
Demo by Eric Bourassa (EN)
Demo by Brett Kingman (EN)
Official Product Video (EN)