A channel is a number from 0-15 which corresponds to channels 1-16.

A pitch is a number from 0-127 and corresponds to a note on the instrument.

A velocity is a number from 0-127. The numbers 1-127 correspond to how fast the key (or string) is pressed (most terminology is in reference to keyboards). 0 indicates that the key (or string) is released.

A pressure is a number from 0-127 and corresponds to the characteristics of how the key is hit.

A program is a number from 0-127 and corresponds to the instrument to use. See the MIDI Instrument table.

Most Significant Bits.

Least Significant Bits.

Manufacturer's Id Code. Used to enter System Exclusive Mode which is specific to the manufacturer of the device.

A song is a rhythm machine.