Pacemaker app received an update today and is now supporting .m4a (AAC) audio format! Many Pacemaker users have been asking why some of the tracks bought on iTunes don't show in the Pacemaker app? This is due to some difficulties the developers have had implementing support for .m4a, which is the audio file format on iTunes. This problem is now solved, so please update to the latest version of Pacemaker v220.127.116.11 and you'll be able to mix all the tunes you love from your iTunes library. You can download a free trial version of Pacemaker here. Otherwise, hit the link below for the full version.