When opening or preloading an AIFF soundfile sfplay~ / sflist~ report the file's sustain and release loop points to the Max console. Nevertheless, it seems currently not possible to actually use the loop point info for playback without taking detours via sfinfo~ and buffer~. I know there are 3rd party objects that read and output the soundfiles' header info. It seems odd though that sfplay~ knows about the loop points but cannot use them.
Can reading and using loop points be done in one step? Same for WAV files whose loop data currently is not read at all.