The Doobie Brothers's "Long Train Runnin'" U S Double Vib tone. Built around the U S Double Vib amp with 4x12 Cali V30 cabinet. Effects include modulation (Chorus), reverb (Reverb Room). • Snapshot 1: RHYTHM • Snapshot 2: SOLO Variax configured with Model 12, custom tuning, magnetic pickups, volume at -10%, tone at -10%.