1. Main tuning knob. 2. Standard General crystal/band switch. I have the Novice version. Thanks in advance and 73. Gary H. Harmon Jr 6003 Archwood San Antonio, TX 78239-1504 (210) 657-1549 home (210) 884-6926 cell gharmon at idworld.net <mailto:gharmon at idworld.net> k5jwkgary at Gmail.com