1) Yes you can use it in front of a POD
2)It works on all strings you can go from e standard to drop d but you could go from e standard to d standard or from drop d to drop c...
IMHO these pitch shifter are not 100% on the spot. They shift your tuning but its not always in tune, they sound a little off and it sucks tone too. This is only neccessary if you have to switch tunig within a song. If you change tunings from song to song then it's much less of a hassle to switch to another guitar!
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