Finally I fixed it. Thanks to everyone, especially Quench.
This turned out to be U13 (74LS30).
My symptoms were No sound at all. Sounds Plus was tested good. No 5v at TP2 on vocalizer. All roms and sockets were tested and verified good. IDE cable and socket tested good. I was getting 5.02V at TP2 after replacing CR1 - CR3 and a new 7805 regulator. Replaced a crummy looking 78LS04 (u12) and MC3403 (u11). Finally thought to replace the u13 (74LS30) after pin 8 was stuck low all the time, even after reset.
Several asked me why I wanted a Vocalizer and SP? I had a nice working S&T in my Flash Gordon that I recently recapped and serviced. I thought (and still think) The SP and Vocalizer sounds better.
The speech is much clearer, and the sound, especially the lower end sounds, are killer. The start up tone, the low tones in a target strike, and the low end of the "dut-dut-dut Fllllaaasshh" on the center kick hole sound way better. I did recently reccap both the SP and S&T, so this is a fair comparison.
I was also asked if the SP and vocalizer are plug and play in a machine that had a Squawk & Talk. Yes, they are.
You can run the SP and Vocalizer with and Altek or Weebly mpu. Mine is running great with an older Altek from 2012. There is no delay in sound or speech calls.
Thanks again, mk