Instead of using the Catpure object, you may use the Media object: http://docs.phonegap.com/en/3.2.0/cordova_media_media.md.html#Media
This object makes it possible to interface the mic directly, without launching the device's audio recording application.
Some examples are found here: http://docs.phonegap.com/en/3.2.0/cordova_media_media.md.html#media.startRecord_quick_example