Musicians perform, that's what they do. In creating an album (some) musicians double as composers, arrangers, programmers etc. The Beatles used tape loops stretching from one tape recorder to another (Tomorrow never knows, 1966). Clever as that was, possibly genius, it was not musicianship. Musicians perform. Preparing music however, has to be called something else.

So what if you do piece together something, using cutouts from Beatles' records? You're a composer. A good or a bad one, depending on the result. You may also well be a dirty, rotten, thieving scoundrel, but that's another story. Like Oscar Wilde wrote, to accuse an artist of stealing is to confuse an aestethical problem with an ethical one.

With Acid it is possible to produce complex and well-sounding works that almost resemble music. It is also possible to produce music. And when you do, you're a composer.

If you played instruments and created loops yourself in the process, then you will have been a musician doing that. But making the conceptual musical decicions and putting it all together in Acid is composing.
Tor