Comment 9 for bug 608948

Note: I haven't tested anything, but I saw something to lookout for with the
patch.
The patch doesn't address the crash issue directly, but will presumably let the
playbackspeed get even lower. As Erik says in his post the crash is caused by
us - his patch just gets the ratio boundaries using the correct lib functions.
It should fix most cases since the minimum slider value is 0.01, and the patch
allows down to 1/256.
But if you have a track at a high sample rate with a project audio rate at a
lower sample rate and have the playback speed at a low value it may trigger
this crash depending on how we use the concatenate ratios.