Farndurk VALVEN is a true bypass overdrive unit that we designed around the JRC4558D engine. The core circuit is the Farndurk Valven OD circuit. The Valven circuit is designed to be very verstaile, and we are able to get many useable tones from it, through several varitaions we have of this core circuit. We can set it up with more or less midrange emphasis, several types of tonal voicings, and many many different types of clipping, both hard (grounded) and soft (feedback loop). The Valven OD circuit has several clipping "doctrines" built in to it's core, and the break-points and responsiveness of the signal can easily be changed to suit the user. We can spec each Valven to have medium gain, heavy gain, early0breakup boost, whatever the user needs... we can do just about anything you want with this circuit.