Everything's actually playing fine now, it just cuts out any and all silence before an instrument comes in and occasionally plays a little weird during the song (i.e. the strings in Windy that usually start at 1:43 or so come in right at the start when made to play solo, the bass loses a couple notes off the intro when playing solo, the lead banjo skips as it starts up, etc). I think my only playing issues were with me occasionally forgetting to close the file in the hex editor, which forbids Winamp from reading it.