Audio to Text ? Like what a ba** drum to "boom" or a shaker to "sh-sh-sh" ? LOL !!!
i dont think thats what he meant, cos if it is then duke is a few spanners short of a toolbox..but if you mean a means to take what you play at one time and convert that into musical notes, then i might be able to help you...clarify yourself man...
"playing drums, guitar etc and simultaneously have the drum line or guitar translated into musical notes"?
if so, i might be able to help!