You can use the ABY MIX to use two instruments at the same time. This is an easy solution for teaching a guitar lesson on the same amp or having an impromptu jam with a friend. The level control can tame or boost each instrument’s signal so no matter each guitar’s pickup output you will be able to mix in the right volume. Certain instruments that have dual outputs, such as a Harp, can be mixed in easily to a single output.