raw files in buffer~ ?

In order to make these raw sounds we get by playing non-audio files, i try to import such files (any type) into a buffer~ ... thought it should be possible, as we can specify the file type to buffer~ using [prepend filetype].

But each time i try to import anything (~ else than audio), i get an -error 2048, or "couldn'f find an audio track in movie file" if it's jpg/graphic file.

... Ok so it means buffer~ only wants audio ?

Works with sfplay~ though, but i want to play it very fast / at different indexes / change sample on-the-fly, and in a superstitious way i would rather do it with a buffer than with sfplay~ and seek ...