Yes, I've written indicators that give voice alerts. These are simple wave files of recorded speech. Actually that is not true, they are computer based text to speech using a british female voice that is then converted to a wave file and I call the wavefile with from the alert function directly or the playsound.

If you are talking about computer based speech generated at the time of the alert for perhaps a dynamically changing message, I'm pretty sure that can be done and hopefully @jmont1 will chime in as I think he has done some work along those lines.

Hi wondered if you could recommend a good text to speech website, as Ninjatrader, said that they officially do not support this, as it can create problems. If so. Do you experience any problems.

Hello,

I suspect the support issue is trying to directly use the text to speech engine within Ninjatrader which would be outside their scope of support. What I was writing about previously was using recorded text to speech as a sound file which can be played as a sound file within Ninjatrader using their PlaySound() method or the Alert() method.

The site I was using to generate the text to speech sound files is now closed, however here is another free one: From Text To Speech - Free online TTS service

Hope that helps.