[PD] Quicktime Synth via IAC Bus from Pd?

[Peter P.]

Hi list,

when I still had to use OS X there was the Quicktime synthesizer
available as a Midi software synthesizer in the OS. 
It was quite handy to quickly play a few notes from Pd's Midi objects.
It seems to be gone from current (mobile-phone-like) versions of OS X. Is
this correct? Is there an alternative inside the OS or can anyone
recommend a good (preferable open source) replacement that works over
the IAC bus?

Thanks!
P