During the Fire Garden tour, Vai used 2 reverbs in his effects rack.
According to Dave Amato in this Rig Rundown at (13:34), he uses the Roland SRV-2000 rack unit in his live rig.
"For effects, I use an old Roland SRV2000 and three Yamaha D1500 delays."
Roland SRV 2000 (3x)
This 1988 Article states he was using a Roland SRV-2000 Reverb.
mentioned 9th under processors
I have 2 of these. They are Rolands cheap version of AMS reverb.
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