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jack : Connects foot switch (push on / push off)(not include) to switching [DRIVE] channel to [NORMAL] channel 2. INPUT jack : Plug from your guitar here. 3. PHONES, REC jack : Connects earphones, using stereo 1/4" plug. Connects stereo or mono mini plug(1/4") for line out to the other amp or recorder. 4. AUX INPUT jack : Connects stereo mini plug(1/4") from music output of MP3, CDP or PC (Notice : Aux input jack can not work when guitar input jack is empty.) DRIVE CHANNEL 1. CONTOUR : A