S.A.M. -- the Software Automatic Mouth -- a versatile, high-quality speech synthesizer created entirely in software. You have added quality speech to your personal computer for a lower cost than ever before possible and, in the bargain, have gained features that other speech synthesizers cannot offer.

S.A.M. is designed to be easy to use. With a couple of simple program statements, you can add speech to your BASIC or assembly-language programs. When you have mastered the easy-to-learn phonetic alphabet, the inflection system, and the use of pitch and speed controls, you will be amazed at what you can make S.A.M. do. And, until then it will already match the performance of other speech synthesizers.

Note - this is a really bad scan of the manual, but it's the only Commodore 64 version I could find.