First designed in 1960 by Abbey Road Head of Technical Bill Livey, Deputy Head Len Page and seasoned EMI Audio Designer Mike Batchelor, the EMI/Abbey Road RS124 compressor is one of the most coveted pieces of recording equipment ever developed.

Still in use today at Abbey Road Studios, and most recognized for its use at virtually every Beatles recording session, the RS124’s true inner-workings have remained an enigma to recording engineers. Through the years, from incomplete information and supposition, some have tried to recreate the RS124 compressor, though never fully realizing the elusive signal processor.