I'm not sure if it would run on 4.1, but Kaboom Factory may be an option. I *think* it runs on System 6.
Kaboom Factory was a simple sound editing program that shipped with the Kaboom sound package (which also included tons of sounds and a control panel). Off the top of my head, I think it plays AIFF and WAV, but I'm not 100% certain, as I haven't used the program in a long time.
Kaboom Factory was a simple sound editing program that shipped with the Kaboom sound package (which also included tons of sounds and a control panel). Off the top of my head, I think it plays AIFF and WAV, but I'm not 100% certain, as I haven't used the program in a long time.