Скачать или смотреть Boss DF-2 - Super Feedbacker and Distortion (aka Super Distortion and Feedbacker) - No Talking

The DF-2 is a distortion pedal in between a DS-1 and a Rat with the added option of holding down the footswitch for endless sustain(?) in overtone harmonic form of single notes. With the overtone dial you adjust the overtone that you want to feed back. When you step on the pedal and hold it down, it feeds the note back until you release the pedal. This way you don't need to play at full volume to get a feedback sound. The feedbacked note will stop immediately when you release the pedal. There is unfortunately not way to get a smooth trailing off.

This pedal is the same, but not as rare as, the "Super Distortion and Feedbacker" pedal, which ran afoul of Seymour Duncan in regards to the name being too similar to the "Super Distortion" pickup.

Buy on Reverb
https://reverb.grsm.io/boss-df2

Buy on eBay
https://ebay.us/4u7e4E