New answers tagged trombone
What you're asking about is called Live Looping. The most common way of achieving this (that I have seen) is to use a dedicated looping pedal. Manufacturers such as Boss, TC Electronic, and Electro-Harmonix have a range of options available. If you're set on using an iPad, the most popular app seems to be Loopy. You'll also need a way to get audio cleanly ...
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