Digital Multi Effect Yamaha SPX990 is sophisticated digital reverberation and effect machine that offers 80 preset effect programs such as natural reverberation and early reflections, delay and echo effects, gated effects, a versatile compressor, delay harmonic driver, multiple effects, freeze (sampling) programs which can do loop playback and many others. Yamaha SPX990 is fully MIDI-compatible. It has analogue input and output terminals that can be switched to match -20dBm or +4dBm line levels, providing compatibility with a broader range of sound equipment. External data storage is provided by a card slot that accepts optional RAM cards that can be used to store effect programs.