ftp.nice.ch/pub/next/unix/audio/cmix.s.tar.gz#/cmix/objc/Evp.h

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#import <objc/Object.h>

@interface Evp: Object
{
	float qzero,q1,q2,q3,q4;
	float *risef,*decayf;
}
+create;
-dur:(float)aDur rise:(float)aRise decay:(float)aDecay 
                          risefunction:(float *)aFunction
			   decayfunction:(float *)bFunction
			   risesize:(int)aSize
			   sr:(int)aSR;
			   
-(float)getval:(int)nsample;
@end

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