oooooooo, that's a tough one to do. if it's in the chord sound, you will have to take the whole thing out.
which you should just re-record the riff, i know that sucks coz i'm plagued by that myself.
unless the chord change is slow enough to see a line between the changes that u can take out. which you might be talking about but still hear it. close the info and do it again when the riff is not playbacking.
then listen.
hope i helped
