ftp.nice.ch/pub/next/unix/audio/Cmix.N.s.tar.gz#/cmix/lib/pchmidi.c

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float pchmidi(midinote)
unsigned char midinote;
{
	float pchoct();
	return (pchoct(((float)midinote/12.) + 3.));
}
int midipch(pch)
float pch;
{
	return((int)((octpch(pch)-3.0) * 12.+ .5));
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.