ftp.nice.ch/pub/next/audio/editor/SynthBuilder.s.tar.gz#/SynthBuilder/PianoOctave.h

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#import <appkit/Control.h>

@interface PianoOctave : Control
    /* One octave of a piano keyboard view */
{
    NXRect keyRects[19];	/* The rects for the keys */
    int keyStates[12];		/* The state of the keys */
    int value;			/* The key being clicked on */
    id target;			/* Who gets tapped when a key goes down */
    SEL action;			/* The message that gets sent */
}

- setKey:(int) keyNum toState:(int) state;
- (int)state:(int)keyNum;

@end

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