I just bought an Ampeg B5R and was wondering about what footswitch(es) to use. The manual really doesn't address this. There are two footswitch inputs in the back; one for changing the octavizer, the other for changing/mixing channels. The octave footswitch input requires a 2 switch footswitch. The channel input needs only a 1 switch footswitch. Do I have to get one 2 switch (for the octavizer), plus one 1 footswitch (for the channel mixer) or does the head accept a three switch Ampeg footswitch.