This document is the operation manual for the Yamaha SPX990 Professional Multi-effect Processor. It provides instructions on using the device's features, including its 20-bit A/D conversion, various preset effects like reverb, delay, modulation, pitch change, and complex combinations. The manual details how to operate function keys, use the data entry dial, and manage memory via RAM cards or MIDI.
The unit delivers a full, flat frequency response from 20Hz to 20kHz.
The SPX990 offers 80 preset effect programs.