When giving instructions regarding "A" roads my iGO voice pronounces the "A" as "eye"
Also the word "recalculating" is pronounced "recalsulating"
Loquendo speech engine and Daniel Nuance TTS voice currently in use.
Edit: Forgot to mention I am using Android. Maybe this post has been moved to wrong section but no worries.
Problem sorted. I was using an outdated voice engine namely Loquendo.
Updated to latest VocalizerEx. Everything fine now.