Why gaps occur at wikipedia
the way vox12string called is ok: do it yourself. you have nero, so you can use nero wave editor.
do simular as allways when you want to burn.
but before actually hitting the burn-button, select the first file to burn in the left field, than hit 'edit'. wave editor will appear.edit like mentioned above with vox12string.than save, and select file 2 etc.
but it remains slow, you decide it's worth trying.
let us know, please.