ARTA, yes that's it, I couldn't remember the name.

On Soundedit 16, this from James Wang's old MacAV FAQ:

SoundEdit Pro must be updated to version 1.0.5 to recognize the 16-bit audio capabilities of a 660av or 840av. Macromedia has since released the more capable SoundEdit 16.

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I take it that means that "the more capable Soundedit 16" is ARTA-compatible.