User Manual

VS1003
8 FUNCTIONAL DESCRIPTION
8.2.4 Supported MIDI Formats
General MIDI and SP-MIDI format 0 files are played. Format 1 and 2 files must be converted to
format 0 by the user. The maximum simultaneous polyphony is 40. Actual polyphony depends
on the internal clock rate (which is user-selectable), the instruments used, and the possible
postprocessing effects enabled, such as bass and treble enhancers. The polyphony restriction
algorithm makes use of the SP-MIDI MIP table, if present.
36.86 MHz (3.0× input clock) achieves 16-26 simultaneous sustained notes. The instantaneous
amount of notes can be larger. 36 MHz is a fair compromise between power consumption and
quality, but higher clocks can be used to increase polyphony.
VS1003b implements 36 distinct instruments. Each melodic, effect, and percussion instrument
is mapped into one of these instruments.
VS1003b
Melodic Effect Percussion
piano reverse cymbal bass drum
vibraphone guitar fret noise snare
organ breath closed hihat
guitar seashore open hihat
distortion guitar bird tweet high tom
bass telephone low tom
violin helicopter crash cymbal 2
strings applause ride cymbal
trumpet gunshot tambourine
sax high conga
flute low conga
lead maracas
pad claves
steeldrum
Version: 1.08, 2014-12-19 26