Seems to me that you're breaking the vumeter functionality. Notice for
example the \r, which doesn't make any sense with log#f (with which,
btw, you shouldn't use \n and %! either). The whole point of the
vumeter is to display on standard output, not mixed with logs. I think
that vumeter should still use printf, at least when not in scroll
mode.
For the rest, I'm happy.
-- 
David

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