The HotPaw Sing-inTuna app has been updated to version 2.1.2, with improved audio processing and graphics performance. This should help reduce the random low frequency dots that occasionally appear in the voice pitch graph.
The MorseTest app has been updated to version 1.1.6, with support for a couple new Morse Code punctuation characters added. VoiceOver support should also be improved in this update.
Blind Talking Tuner has been update to version 1.0.1, with an easier to understand speech synthesizer voice.
Austin Seraphin wrote a nice blog post reviewing the HotPaw Morse2Text Morse code text entry app.