-Frank Zappa / Paul and Allison Buff: Kepex Allison Research Demonstration Record, ULTRARARE! 1970 USA 'Version 2' vinyl promo-only 7"ep, really strong to locate in any condition and one of the rarest Zappa related single. This record was delivered together with Buff's sound systems and gives sound examples, Allison Buff explains how to use it. 'Electronics engineer Paul Buff opened