A signal processor or type of computer capable of performing several different processing functions. In the case of the computer, the functions are done simultaneously; in the case of the signal processor, the functions are performed in series, yet appears to a musician as if all functions or effects are happening at the same time.
MULTIPROCESSOR
Meaning of MULTIPROCESSOR in English
Guitar English glossary. Английский словарь гитарных терминов . 2012