Is there any app that speaks out the characters you type? on Android?
I find this would be the best way for me to train, while laying in bed, with my eyes closed
Tutor 2 Alpha will do that:https://twiddler.tekgear.com/tutor2/
I use an app called Type and Speak for this, and have it configured to read the complete word when I finish typing.
Unfortunately it's been pulled from the app store but you can still find the APK.