- Old Blood Noise Endeavors BL-37 Reverb; Effects Pedal for Electric Guitar; more immediate and degraded than any other Reverb; goes from quick and highly reflective to slow and stretchy with noticeable pitched undulations; the clock slider affects the sample rate that determines signal fidelity, the timing of the reverb and the speed of the modulation; Controls: Volume, Mix, Clock, Feedback; Push Buttons: ; LED: Effect On; Display: ; Footswitches: Effect On; Connections: Input (1/4" Jack), Output (1/4" Jack); Power Supply connector: Barrel Connector 5.5 x 2.1 mm, center negative; Current Draw: 110 mA; powered by a 9 V DC Power Supply (not included); suitable optional Power Supply: Item no. #409939; True Bypass; Dimensions (W x D x H): 66 x 120 x 58 mm (2,6" x 4,72" x 2,28"); Weight: 300 g (0,66 lbs); Handmade in USA; Note: Battery operation is not supported