One of the prior replies indicated that Osmand uses the Android text to
speech subsystem.
Therefore, the answer to your question of why the voice changed is:
Because Google changed the voice they use as part of the Android OS
text to speech system.
I.e., Osmand does not supply the voice you hear, that voice is built
into Android. If Google changes the voice they use in Android, then
the voice you hear changes.
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