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According to Dave Amato in this video at (11:20), he uses Yamaha SPX90 digital effects processors in his live rig. "I know they're old," he said, "but I just love the way they sound." Accordint to the Premier Guitar article [here](http://www.premierguitar.com/articles/17077-rig-rundown---reo-speedwagons-dave-amato) "With a Bob Bradshaw-designed rig, Amato is able to cover a lot of ground. In the rack for his main rig he has a Yamaha SPX90 Delay, Roland SRV-2000 reverb, Eventide Ultra Harmonizer, DBX 160A compressor, TC Electronic 2290 delay, TC Electronic 1210 Spatial Expander+Chorus/Flanger, and a Lexicon PCM70. The upper rack houses his "B" rig, which contains a Dunlop Tremolo, Korg ToneWorks G4 Rotary Speaker Simulator, Dunlop Uni-Vibe, MXR Noise Gate, Boss DSD-2 Digital Sampler/Delay, Boss DD-3 Digital Delay, Boss RV-3 Digital Reverb/Delay, Boss PS-3 Pitch Shifter, and a Line 6 MM-4."more
Warren described his live rig his Guitar World interview, April 1987: "The output of [Marshall 100-watt amplifier's] preamp section goes into a control board for the effects I’m using, which are a Lexicon PCM-41 delay, a PCM-42 delay, and the Yamaha SPX90." Ratt only seemed to have custom-made midi or relay switchers on stage instead of pedalboards. As you can see, Warren and Robbin had some similarities in their rigs, with SPX90 being one of them.more