For a dedicated program track, you only need USB and the PS14 power supply. You only need a Loconet connection to use the PR3 in 'MS100 mode' to control your system.
You did get several replies. But ignore the part about connecting a motor, the SoundBug programs just fine just clip-leaded to the PR3's track connection. I was bored one day and downloaded every sound project on the Digitrax site and tested them all out on mine. My PR3 is connected to a short section of track all mounted on a pieceof wood, so I just took a pair of clip leads fromt he rails to the power connections on the SoundBug and away it went.
The Digitrax sound and motor combo decoders might ned a motor connected to program properly, but the SOundBug doesn't.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
You only need to establish the USB connection to the PC and attach the program track. I use mine completely independent of my layout and Loconet.
Simon Modelling CB&Q and Wabash See my slowly evolving layout on my picturetrail site http://www.picturetrail.com/simontrains and our videos at http://www.youtube.com/user/MrCrispybake?feature=mhum
Do I need to connect loconet on PR3 just to use soundloader to use on a Soundbug?
Or do I simply need to connect the Soundbug via the programming track terminals? That's what it looks like from the instructions, but thought I would ask first...