Though MIDI has done an exceptional job of digitizing music for the last 37 years, it hasn’t been perfect. MIDI quantizes music, meaning it forces music components into a particular value. In MIDI 1.0, all data was in 7-bit values. That means musical qualities were quantized on a scale of 0 to 127. Features like volume, pitch, and how much of the sound should come out of the right or left speaker are all measured on this scale, with 128 possible points. This is not a lot of resolution. – Quartz