The "Track 1" is text displayed by the 1 Pixel Out player when the "Track" description from the mp3 cannot be read by the flash player. In order for the 1 Pixel Out player to be able to read the mp3 ID3 information, the media files need to be hosted by the same server as the Flash .swf file. This is a security issue built into Flash that prevents this from working.
The media file also needs to have the "title" set using an ID3 editor such as iTunes.
Because web based plays are only a small fraction of your total podcast consumption, we simplified this by allowing you to set a custom message in the player. To do this, go to PowerPress > "Audio Player" page, select the "basic settings" tab and look for the option titled "Text In Player ". You most likely have "TRACK" entered, simply replace with your own custom message to appear when ever someone clicks play. For my podcast, I display "Your listening to Plugins".