TO INCLUDE the PLAY OBJECT IN YOUR APPLICATION, You'll need to add the line LDFLAGS = -sectcreate __SND play.snd play.snd in you Makefile.preamble This includes the file play.snd (the DSP program for sampling rate conversion) into the executable Mach_O segment. If you don't do that, your application will crash when you try to play a sound (it will complain that it can't find the DSP file!).
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.