Synthetic Bleats (audio) Cell Press Share Print E-Mail Loading audio... Caption This is a recording of synthetic bleats with a 3% shift in the fourth formant. Credit Benjamin D. Charlton Usage Restrictions Credit Required. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.