TFwiki has some info on MP Soundwave finally.
Masterpiece Soundwave was released on January 2013. He transforms into his G1 tape deck alt-mode and comes with Cassetticon Condor/Laserbeak. A more intricately engineered version of his G1 counterpart, Soundwave in cassette recorder mode is roughly the same size but is twice as thick. Unlike the previous release, he does not come with pseudo "batteries". Instead, one of the batteries has been incorporated into his shoulder mounted concussion blaster while the other is mounted on his left back panel. The "cassette recorder" mode can hold up to three of his cassetticon cadre at once with a mechanism that allows them to "eject" from his chest cavity one after the other. Both the original G1 cassettes and the Masterpieces releases are compatible for storing in his chest compartment. In robot mode, he stands roughly the same height as G1 Blaster/Broadcast, with multiple points of articulation, die-cast foot module and joints and a selection of accessories seen in the G1 show.Megatron's Walther P-38 mode can easily be handled by him, while the energon cube adapter /grid display panel can be connected to his chest to simulate his readouts of the Victory's blue prints and intel reports written in Cybertronian characters(which can be clipped off his instruction manual and fitted in between). A hand mounted sensor probe is also included which was used in searching for a potent power source. Condor/Laserbeak also has been engineered to transform as close to his animation version to the extent that he no longer has his chromed thruster blaster add-ons as a separate kibble. On his forehead, a camera module can be extended to simulate his espionage monitoring activities. Two versions of him were released, the Amazon Japan exclusive that came with two additional energon cubes and an Asian version that came with a commemorative coin contained in a die cut card designed as Soundwaves' cassette mode facsimile.