I have just rebuilt CS5 for OSX.  It has FLTK but the rt audio is
bad.  If I set a large -b it pulses.  With default -b it just
stutters.  I thought that this had been fixed?  Did I misunderstand?
I was looking at it but abandoned the changes when I heard that others
had been dealing with the callback stuff (whicg remains a confusion to
me).
  I will copy a snapshot though as it is better than previous.
==John ffitch