Check the listing for details. Synergy Soldano SLO-II 2-channel Preamp Module. Condition: Very Good - Refurbished. Listed at 359.99 USD. Classic Soldano Sound — Upgraded with Channel-specific Controls Boasting the same iconic Soldano tone as the original module, the Synergy Soldano SLO II ups the ante with a whole host of channel-specific sound-shaping tools. From the addition of a secondary 3-band EQ to Crunch/Overdrive and Normal/Tight switches, the Synergy Soldano SLO II’s versatility remains almost unparalleled within the world of Soldano-style amplifiers. And just like the original module, the SLO II is no mere clone or emulation — this tube-driven preamp module was designed by the one and only Mike Soldano to perfectly capture the thick, clear, and remarkably responsive sizzle made famous by guitarists ranging from Eric Clapton to Warren DeMartini to Warren Haynes.