I have somehow managed to turn off (or lose?) all voice guidance in my OsmAnd+. Originally I started messing about because the voice output was corrupted; this turned out to be outside the app, because the same problem occurred with another app that uses text to speech. I cured this by replacing the OEM’s TTS (Pico TTS) with Google Text-to-speech Engine, which works in the other app, but OsmAnd is silent. There must be some setting somewhere that turns out this functionality for OsmAnd, but I can’t find it.