I just bought a 500 w/o the cable or pedal from a local guitar shop. First of all, is there somewhere I can get the pedal? If not, can I plug the cable into my spider amp so that I don't have to use the batteries? My first choice would be to find the cable, because if I'm not mistaken, I can't use the alternate tunings without it. (I can't pick the guitar up until Friday because it is used and legally can't be released until a month after it is bought by the store.) Thanks.