If I were you, I would use the Floorboard with the Pod Pro.
Run the MIDI OUT of the Pod Pro to the MIDI IN on your G-Major and you'll be set...
The POD generates a logical set of Program Change messages:
Bank 1, Preset A = MIDI Program 01
Bank 1, Preset B = MIDI Program 02
Bank 1, Preset C = MIDI Program 03
Bank 1, Preset D = MIDI Program 04
Bank 2, Preset A = MIDI Program 05
Bank 2, Preset B = MIDI Program 06
Bank 2, Preset C = MIDI Program 07
Bank 2, Preset D = MIDI Program 08
And so on...
That way, you have very little on the floor, you have a built-in tuner, volume &
wah pedals, and much sturdier buttons than just about any other MIDI floor unit.
Since 99% of all MIDI floor pedals use the generic "ALL DEVICES ON ONE MIDI CHANNEL" design, the floorboard is gonna work exactly the same as most others for channel/effect switching.
The only thing better would be a DMC Ground Control pedal, and if you used it in conjunction with the DMC GCX, you could stick yer stompbox in the rack and switch it via MIDI. This setup is gonna run you around $400 (IF YOU'RE LUCKY AND FIND IT USED...) then you'll need a wah and
volume pedal and extra cables running out from your rig.
With this setup, you can set the POD Pro to MIDI Channel 1 and the G-Major to MIDI channel 2. Then you can set up your basic sounds on four or five presets in the Pod Pro and set up a handful of effects in the G-Major. When you want basic rhythm, you always call up Bank 1, Preset A on the Pod if you wanna add a separate chorus or flange preset, you still use the same bank/preset in the Pod, but assign it to a different number on your floor unit. This, to me, is the beauty of the DMC stuff, cuz I don't have to have fifty copies of my Rhythm settings in my Intellifex -- no matter what bank I'm in, the Intellifex is always on preset 1 when I'm playing basic rhythm.
Also, the new Ground Control pedal has the bullet-proof buttons like the Floorboard, but it's brand-new, so don't expect to find one used.