S.A.M. by Tronix - Loved this program as a kid, but I never knew you could incorporate SAM into your own programs,  Included in this archive are a couple versions of the documentation, one in text, a crappy scan of the C64 manual as PDF (would love to find a clean scan if anyone has it), and a nice clean scan of the Apple version of the manual.  One thing to note - the disk image I found from the LLCUG collection seems to be the most complete version on the net and isn't hacked in any way.

Congratulations!
You have just purchased 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.