The SOS 04 ’Roger that 4644’ pack contains 40 captures of the Roger Mayer 4644 Drive in each of the ToneX, NAM Standard and NAM Nano formats. (Full details above.)
 
Here's what Roger Mayer say about their/his pedal,  'Designed as a no compromise design the 4644 Drive excels giving the guitarist performance that stands out from the usual devices he may have previously encountered. ULTRA WIDEBAND DISCRETE DESIGN produces transparency and detail that cannot be obtained from conventional op-amp designs.

The 4644 Drive harmonics are generated by our PROPRIETARY FEED FORWARD DESIGN with zero phase, time delay or any other nasty artefacts that simply means it is so fast that it will follow and track all your playing techniques perfectly. This optimised series of harmonics produced are very musical and natural sounding over a wide dynamic range. '