No, there's no "W"...BUT I think I found something very interesting:
I hear absolutely NO GAP, when I send the wav-files through
"LAME --alt-preset standard --nogap <file1> <file2> ... <filex>"
and listen to them as they are or with ID3-tags added.
Problem is, the empeg doesn't know the correct track-times after this step (usually it thinks the tracks are much longer because the time is calculated from the first vbr-frame or so), so I need to send these mp3's through vbrfix to fix the track-time... after that step, I CAN hear the gaps !
So, as far as I understand this, there is a problem with the gaps ONLY if the time-/frame-value in the header is correct or less than the actual track, but there is NO problem, if that value in the header is HIGHER...
Or to put it simpler:
no gaps if the tracks are shorter than the empeg thinks.
I tried this on several tracks and have the same tracks on my empeg in several states (after LAME, after vbrfix, with ID-tags and without) and so far it really seems to be that way...