public void startRecord() throws Exception{
        if (record != null){
            record.release();
        }

        File fileOut = new File(FILE);
        if (fileOut != null){
            fileOut.delete(); // delete any existing file at that location.
        }

        record = new MediaRecorder();
        record.setAudioSource(MediaRecorder.AudioSource.MIC);
        record.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        record.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        record.setOutputFile(FILE);

        record.prepare();
        record.start();
    }

"-.... .---- -.... -.-. -.... ..... --... ---.."

char[] chars = message.toCharArray();
for (char ch : chars) {
    //add to audio file
}