A neat piece of vintage rack gear.
Here is the original writeup circa 1986
The Yamaha SPX90II is an amalgam of advanced acoustical research and digital technology designed to provide musicians and home recording enthusiasts with a wide range of exciting effects.
The Yamaha SPX90II Digital Multi-Effect Processor utilizes highly refined LSI (Large Scale-Integration) technology to create natural reverberation. Not only is its assortment of 30 preset efects comprehensive enough to suit most studio and performance applications, the Yamaha SPX90II also allows you to create up to 60 additional effects and store them for instant recall.
The Yamaha SPX90II can create effects for beyond mere reverberation, though that in itself is of a truly superior quality. A variety of echo, delay, and special effects - each with comprehensive parameter adjustments - can be accessed at the touch of a switch. And as the Yamaha SPX90II is MIDI compatible, it can be programmed to apply separate reverberation effects to a variety of MIDI compatible instruments.
Your Yamaha SPX90II Digital Multi-Effect Processor will prove extremely useful in a variety of applications: acoustic electric, PA, MIDI instrument, and home recording systems. In order to take advantage of the vast potential of this component, we urge you to study this manual before connecting the SPX90II to your system.
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