The PCR2 Classic Keys features authentic reproductions of "vintage" keyboard sounds, which over the years have become essential to the modern keyboardist. It contains samples of the following instruments: Hohner Clavinet (Treble Pickup Setting and Release Thump), Mellotron (Strings, Choir and Flute), ARP String Ensemble, Hohner Pianet, Yamaha CP-80 Electric Grand Piano (Soft and Hard Strikes), and RMI Electra-Piano (Piano, Harpsi and Accenter). Classic Keys also makes use of the PC2 base ROM samples, and includes new "vintage" Rhodes, Wurlitzer and KB3 programs.

The samples in this set are of the highest quality, having been recorded and processed with the expertise for which Kurzweil is famous. The PC2's synthesis engine provided a variety of powerful sound-sculpting tools, and the finishing touches were added with the PC2's effects engine, which utilizes the same technology as Kurzweil's acclaimed KDFX (for the K2500/2600 keyboards) and the award-winning KSP8 processor. Kurzweil was able to precisely recreate the timbres from many live and studio recordings, which have helped define the "vintage" sound. Effects pedals, speaker cabinets and recording techniques have all been faithfully replicated, giving the Classic Keys programs a level of detail and realism never before achieved in any "vintage" keyboard emulation.