Custom Plan B Model 37 ELF LFO Eurorack Module

This ELF LFO is fully functional and in good condition.

The Model 37 ELF LFO has an identity problem. While specifically designed as an LFO, it's massive frequency range 1 cycle per 30 seconds to over 20Hkz makes it the perfect candidate for utility audio VCO applications. Incorporating a heavily-modified version of the TAU triangle core architecture, the M37 is capable of 1v/oct tracking across it's entire operating range when the external VC Attenuator is set to the full clockwise position.