ftp.nice.ch/pub/next/developer/hardware/dsp/RecordApp.s.tar.gz#/RecordApp/errors.h

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#include <nextdev/snd_msgs.h>

void check_mach_error(int error_code, char *error_message);
char *snd_error_string(int error);
void check_snddriver_error (int error_code, char *error_message);
void check_snd_error (int error_code, char *error_message);

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