I have a ledwiz-32 (no output) that I use currently. I have a ledwiz+GP on order (looks like it may get here today in fact). I believe the two boards have the same USBid, so they should work interchangeably.
I've attached my testing script. You need libusb and python installed for this to work. I don't have the instructions for installing either off the top of my head, but neither is difficult to get installed.
In my script i call
LWZ_PBA(0,48,0,0,48,0,0,48)
LWZ_PBA(0,0,48,0,0,48,0,0)
LWZ_PBA(48,0,0,48,0,0,48,0)
LWZ_PBA(0,48,0,0,48,0,0,0)
Which sends all 32 inputs an instruction... either off, or the brightest color intensity available to the ledwiz (48). I'm not sure if you send all 32 using the Led-wiz+GP, or just 16. I would assume you send all and the last 16 are just ignored. That data that I'm sending just turns on lights. No sawtooth or other animations. There are other calls that can be made to the ledwiz, but as of today, I don't use them. That will probably change as soon as I get my new board in.