PR2 The PR2 lets SoundFX users download new Project sound files and even reflash the decoder's firmware for latest updates.
PR3 The PR3 lets SoundFX users download new Project sound files and even reflash the sound decoder's firmware for latest updates. The PR3 is different from the PR2 in that it offers a USB 2.0 interface, it offers selectable MS100 mode*, and the PR3 is priced lower.
* The PR3 also incorporates an MS100 emulation mode providing USB/LocoNet connectivity for third party software such as JMRI, Railroad and Co., and others.