Digitech Vocalist IV
Boomerang III
Ground Control Pro
9V A/B switch box

I also will be powering a G-Natural multi-fx from courtesy AC plug.

Can I do all this with one box - either Digital or PP2+?

There isn't really an easy solution here, mainly because the Digitech Vocalist 4 requires AC power and can only be powered using the included power supply or from either of the high current 9V outputs on a Pedal power AC. The Ground Control Pro will accept AC or DC power.

A Pedal Power Digital will power the Boomerang III as well as the Ground Control Pro, and likely the unknown A/B box if it requires power.

I hope that helps!

Thanks John
That's what I figured. If I eliminate the Vocalist and power the GCP, Boomerang and Whirlwind Selector A/B box (9 volt battery-operated) from a Power Pedal Digital and the G-Natural from the ac plug, what cables would I need to purchase in addition to what comes with the box?
pat