Geert Bevin's terrific MIDI Tape Recorder precisely captures MIDI performances, including MPE, verbatim -- not the slightest variation in sound. v2.0 adds a host of new features, plus a standalone version alongside the existing AUv3 plug-in. It's low-level, direct CoreMIDI capture of what you played, exactly as you played it, with every expression intact. And it's and open source.