While Higosign is primarily for signage, in chapter 1, section #, we spoke about 'Soundscapes' and there are a number of tools on the internet to help your staff relay the information you put on signs verbally. After you finish the English of your sign, you can go to these websites and have the language pronounced so your staff can learn the phrases. Higosign does not recommend any of these specifically, we encourage you to look for sites that you can use. Here are a few possibilities.
TTS reader at https://ttsreader.com/is a free web-app that reads out loud any text (typed-in or files) with natural sounding voices. free, super easy, fun and unlimited. It also has 6 speeds from very slow to too fast(!) and a range of voices.
TTS Online, also known as Read the words at https://www.readthewords.com/ offers a free bronze membership which allows you to create audio files up to 30 seconds in length, selecting from 15 voices and 3 languages and allows you to save 50 readings, which would be very useful for training staff
Read Speaker is a site that offers a demonstration page with a number of different voices at https://www.readspeaker.com/voice-demo/
There are sure to be other sites in the future, so do a google search using "text to speech".