Audio reverberators, audio effectors, audio mixers, audio workstations comprised of effectors, mixers, and recorders, audio signal processors, computer software for controlling and expanding the function of all the aforesaid goods, namely, audio signal processing; computer interface boards and electronic circuits for controlling and expanding the function of all the aforesaid goods, namely, audio signal processing; electrical controllers of all the aforesaid goods for audio signal processing; and parts therefor