This new Greer Amps Black Tiger Delay pedal offers more than just your ordinary delay effects - this combines the sounds of two vintage tape delays and an old oil-can delay for a genuinely awesome combo. Its controls are fairly straightforward: Feedback adjusts the numbers of repeats, and when set at or above the dot, it will begin to self-oscillate (it will also self-oscillate in Bypass mode so be sure to pay attention when it's up). Mix adjusts the level of the delayed signal. Time adjusts the delay's time between repeats. Bypass is simply a bypass switch. And the Trails switch allows an existing delayed signal to continue to trail off without any additional input - which is particularly useful when bypassing the effect. So if you're looking for the warmth found in vintage equipment and struggling to find it in modern pedals, the Greer Amps Black Tiger Delay may be just the one. Requires 9-Volt battery or standard negative center power supply.