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Oblivion is a Simple Mic to speaker Echo feedback App which allows you to Echo any other App you want to add the effect too, or by placing a audio source next to the Device which will Echo the heard source, Best used with External Speaker, Compatible with Bluetooth and wired speakers Also compatable with some 3rd party Connection devices such as iRig or home made mic through port wires to allow the App to function as a Echo effects pedal.

Some adjustments and tinkering may be required to get the desired effect.