On Wed, 17 Jul 1996, Jerome Tan wrote:

Does anyone know how to make a home-made telephone voice changer?

While I haven't tried this particular kludge, taking a VSC equipped tape player (Radio Shack used to sell these, and may still) inserting an automotive cassette-stereo CD adapter (the inductive coupling kind that are built into cassette shells) and driving that with a cheap mike & low power audio amp ... should enable you to lower your voice pitch substantially. Have fun, -Doug