Instruments for each ratio column can be specified either as General MIDI instrument numbers (starting from 0 for grand piano), or as Humdrum instrument codes.


Here is a list of General MIDI instruments numbers that can be used in Ratioscores:

The instrument number 14 in the following example is prefixed with the text *I#. Try changing the instrument number to another one in the above list of General MIDI instruments (or click on an instrument in the above list to change the instrument number and play the score).


Text-based codenames can be used to select an instrument:

Try the instrument names in the following test score (you can also click on the instrument code to insert and play automatically):