MacSpeech today announced the certification of the Plantronics Audio 510 USB Ultimate Performance Headset for use with iListen speech recognition software for Mac OS X. MacSpeech’s iListen software allows users to dictate, edit and format text with the power of voice. With the added convenience of a headset and microphone, iListen offers continuous speech recognition capabilities for convenient dictation in normal tone of voice and at a normal pace as well as direct dictation so users can dictate, edit and format text directly in any application.