TTS Speech rate not working in few tablets in android -

TTS Speech rate not working in few tablets in android -

i have created app can read out mail service received gmail. wanted read mails little compared normal. hence called speechrate tts illustration below:

int spreechrate = 2.0; talker = new texttospeech(this, this); talker.setspeechrate(speechrate);

this works fine on galaxy nexus, nexus 10 , samsung galaxy tab 2 doesn't work galaxy tab (old).

is there settings need check in galaxy tab. 2 tabs working didn't check settings @ all?

android text-to-speech