I've got MIDI instruments where I try to follow the instructions here:

http://www.csounds.com/manual/html/MidiInterop.html

and I get the warning in the subject line with every note.  p5 is
plainly legal because the note sounds with the right pitch.  The
warning always names the last p number the instrument uses.  What's
the correct way to do this?  Using a local variable instead of p5 (and
so on) will work but doesn't that break the instrument when it's
called from a score?

Here's a minimal orchestra:

gi_sine_wave	ftgen	0, 0, 8192, 10, 1

	instr	1
	midinoteonkey	p5, p4

ifreq	=	cpsoct(p5/12 + 4)
aout	oscil	100*p4, ifreq, gi_sine_wave

	out	


                                   Graham