Sorry. There are a number of sound programs for early Macs, but neither WAV nor AIFF files existed back then. The early Macs used 8-bit mono 11 or 22 KHz sound files in either boot sound format or Mac Recorder format mostly. WAV and AIFF are both 16 or 24 bits, usually 48 KHz sample rate. An AIFF sound could be downsampled on a modern Mac and saved in one of the old 8-bit formats, but I don't know whether Sound Edit or some such can do it or not. Also because of the small storage on floppy disks, sounds were limited to a few seconds per disk. About the longest sound file would be something like the ever-popular "I'm sorry, Dave, I can't do that."
Look for an early version of Sound Edit, or SoundPlay.