The CP5176 is a FET compressor based on the design that was originally used in the 1176 compressor, which has been adapted to the '500' format of API*.

The EQ573 is an equalizer based on the design that was originally used in the Neve 1073 and 1084 modules, that has been adapted to the '500' format of API*.

The EQP501 is a passive equalizer based on the classic PULTEC EQP 1A, adapted to the '500' format of API*.

It is made of an all passive section followed by a gain make up stage based on a Discrete Op-Amp (DOA).

The LA502 is a soft knee, electro-optical compressor based on the LA2A/LA3A design, which we have adapted to the '500' series format.

The TS500 Tape Simulator is the successor or the Stereo Tape Simulator. It has been adapted to the API* 500 format with a number of enhancements.