[LAU] mix lof with ecasound

Hi all,
i have many .lof[1] files, and i want a final mix (audacity can open
.lof file, but i need one batch script)

ex:
$ cat ab.lof
window
file "a0.wav" offset 0.000000
file "b0.wav" offset 396.000000
file "a1".wav offset 0.000000
file "b1.wav" offset 396.000000

i can make a mix with something like:
$ ecasound -a:1 -i a0.wav -a:2 -i a1.wav -a:all -o output.wav

my problem is offset, i think b0 (and b1) start after 396 sec

i can use ecasound to combine a0+a1+b0+b1 together?

thanks

[1]: lof format:
http://audacityteam.org/wiki/index.php?title=How_to_import_playlists

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