MULTI-EFFECTS AND ANALOG MULTI-EFFECTS COMPUTER SOFTWARE PLATFORMS FOR MIXING RECORDED MUSIC; ELECTRONIC AND ELECTRICAL EFFECTS UNITS FOR MUSICAL INSTRUMENTS; AMPLIFIERS FOR MUSICAL INSTRUMENTS; VIDEO RECORDING, TRANSMITTING AND REPRODUCING APPARATUS; AMPLIFIERS FOR VIDEO; VIDEO PROCESSING APPARATUS; AUDIO MIXING APPARATUS; AUDIO FREQUENCY AMPLIFIER; ELECTRONIC SCALERS FOR AUDIO SIGNALS; AUDIO AMPLIFIER; AUDIO RECORDING, TRANSMITTING, AMPLIFYING, AND REPRODUCING APPARATUS; ELECTRONIC EFFECTS ...