I have late onset CA, and have noticed my speech slurring for about 5 years. (I'm 65)
To begin with I put it down to losing a few back teeth! I now know it's more than this so have been 'training' a different part of my brain to take over speaking. For me this is above my left ear. When I remember to turn this on and speak consciously I get a feedback loop in my head and my speech is much clearer.
This is of course harder work than speaking unconsciously, like I used to for most of my life. So I have been looking for a simple way to practice this so I strengthen the connection in my brain and get better at it.
To this end I have downloaded a free app from the App Store, which is a simple feedback app. Using my phone or iPad and earphones, I can speak out loud and listen to my voice from outside my head at the same time! I have found it best to read something rather than just witter on! But this sort of feedback allows for playing with speed, tonality, accents, funny voices, volume etc.
The trick now is to plan in the time everyday to practice, as it can feel a bit odd doing in front of the wife! Also the microphone picks up all noises so a quiet place alone is best for this.
The iPhone app is called feedback recorder. I'm sure an android version exists too. If you want to make recordings there is a paid upgrade.
Anybody got other ways to fight back?