Since Amazon has the very cool Polly synthesizer, and essentially a plan to use it for free, I wrote this synthesizer app to generate all the WAV files for contesting.
It's been discussed on the N1MM+ reflector for some time. I thought I'd stick it here so you can find the links for download.
You can customize language, pitch, speed, etc,etc. It has a feature to generate WAV files from the supercheckpartial database. I've pre-created recordings in English using one of the best voices in the collection. Feel free to download.
Enjoy -- see you all in CQ WW SSB 2018 from K2LE.
Synthesizer DVK Setup: http://files.w1ve.com/SYNDVK-Setup.exee
All Contest Calls + Prefixes WAV files (2.1 GB): http://files.w1ve.com/SCP-ALL-CALLS.zip
All US/VE Calls (Great for SS,etc): http://files.w1ve.com/SCP-US-VE-TERR-WAV-HQ.zip