ReBirth emulates two Roland TB-303 synthesizers and a Roland TR-808 since v1.0, and also a Roland TR-909 drum machine since v2.0. All emulations can be used simultaneously. Each of the emulated devices has its own pattern selector, a feature the original devices are lacking. This allows fast switches between different musical sequences, and re-programming the TB-303 for playing different notes, for instance, is rendered unnecessary. This feature has been adopted in some of Reason's devices. ReBirth also features mixers, a pattern controlled filter (PCF) and some of the standard effects in software synthesizers like delay, compressor and distortion.