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EXS24 mkII, or EXS24 for short, is Logic’s 64-voice sampler. A sampler is a special kind of instrument that allows you to use pre-recorded audio as waveforms. In other words, instead of an oscillator producing a sine wave or triangle wave, an actual audio file is used as the source waveform instead of an oscillator. Samplers also offer the possibility of using multiple waveforms per note, each waveform triggered at a different velocity or via other MIDI input, to produce detailed representations of instruments or any other sound you can record. One of the most common examples of a sampled instrument sound is a piano. Some piano sample libraries may have 16 or more samples per note, from each note’s attack all the way through to the very last decay of each note, all at different velocities, using a lot of zones to give you an extremely realistic piano sound. These libraries take up multiple gigabytes of hard drive space and can utilize large amounts of RAM to aid in the quick access of the individual samples. Other sample libraries may stretch a sample of one note across a few other notes to help create a smaller memory footprint, while sacrificing a little bit of tonal accuracy.