This is a small golang program that takes a CSV file specifying text and output file, and uses Google Cloud's text-to-speech (TTS) API and WaveNet voices to generate sounds for use in OpenTX transmitter platforms.
If you just want to download the already generated english files, download this repo as a zip file You need to install golang
Follow the steps for the golang speech quickstart
You will need to set the GOOGLE_APPLICATION_CREDENTIALS environment variable to a credential per the quickstart. If you are not otherwise using the API - you should be able to generate many sound clips in the free tier of the service.
If you do not have a development environment set up, you should be able to perform these steps in Cloud Shell. You will need to zip the output files, and download via one of Cloud Shell's options, either download file from cloud-shell menu, or export from code editor.