Chromatic scale

In this example, one octave of chromatic scale is played from the middle C. 

Each time the metro object sends a bang, the counter rolls to report numbers from 0 to 12 that are then added to the number 60, being the pitch C4. These numbers are used as a value to determine the pitch in makenote, and its note-on and note-off messages together with velocity are sent to a MIDI device via noteout.