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22 7 7 Using the Tuner To Tune Your Guitar 1. In Play mode, enter BYPASS or MUTE mode by pressing the Program Up and Down buttons at the same time once (for BYPASS) or by holding them both down for more than half a second (for MUTE) . The display will now show tuning information. 2. Make sure your guitar is connected to the Spitfire, and play the open string you wish to tune. The left digit of the display indicates the pitch nearest that of the open string. If the # decimal point is lit, the not