splay uses the default sound setting to your operating system the quality of this will be poor alot of times you would do best to use the winamp instead of the splay feature i use winamp in my mp3 player you can do so like this
.Play:/set %song1 $sfile($mp3dir,%playlist,Play!) | /run -n %song1
where as %playlist is simply the name of the window which comes up for the files eg. /set %playlist krunch's sounds
hope that helps ..