on the interwebs, of course. stop typing in capitals and learn to search the frikkin web
but your problem is not specific to JJOS, it's the same in the Akai OS. do you have the Akai OS manual? if not, download it NOW and get reading.
let me help you out:
your post subject makes you look retarded. shouting in capitals is how children type.
most people who post here "need help" so the subject is useless. a better subject would be "sound muted out by another sound" (which is still rubbish, because you're not using the right terms, which you'd know if you read the manual, but you're new so I'll let you off.) that way at least people know what you're asking.
the problem you're asking about is one of the most frequently asked problems on this site. it's been answered HUNDREDS of times. Learning to the search function would mean you can find answers yourself.
the problem is that your program is set to mono. change it to poly
now go and read that manual