A addon from [[Draysoft]] & [[Evesham Micros|Evesham Micro Centre]] that enables you to make doublicates of tapes and copy software. The device connects to expansion port, and allows to copy data from an external tape deck to the CPC464's built-in tape recorder.
Draysoft & Evesham Micro Centre also produced a Doubler version for the [[ZX Spectrum]]. According to adverts, the doubler also had "spectacular success on the CBM64".