IMPORTANT SAFETY INSTRUCTIONS. The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the. View online (28 pages) or download PDF (2 MB) Fender Twin-Amp, Twin Amp User manual • Twin-Amp, Twin Amp Musical Instrument Amplifier PDF manual download Consultez gratuitement le manuel de '65 Twin Reverb de Fender ou posez votre question knobs fully clockwise and the treble knob fully counter-clockwise.It is suggested you read this manual thoroughly to understand all the features and functions of the amplifier. The purchase of a Fender amplifier will provide G. VOICE: Selects channel voice type. Tri-color indicator left of knob changes color as each voice type is selected. 01. Fender Clean 1 ('65 Twin-Amp™).