FTSW is an input for a foot-switch, a device you can use to quickly change presets while playing. Some amp manufacturers like for example Fender use them, however in my opinion there is no point in buying a foot-switch, simply buy a desired effect and you can tap it on and off with your foot too, plus the quality of the effect is going to be much better than the quality of the effect in an amp.
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It is one amp current used over one hour. A ten amp hour battery can supply 1/2 an amp for 20 hours, 1 amp for 10 hours, etc.
The impedance is to low causing the amp to shut down
Yes, provided that your amp has line level inputs, and you have the appropriate adapters.
According to me the information about the 3 Volts DC batteries is incomplete i.e.The amp-hr capacity is not provided.If this is known then the answer would be 3X the amp-hr .
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