It will not be fun with the ML-600 and APAD IMO but the TPS-6L should be fine. Take a look here [Link: controlworks.com] . They sell a module and provide you with instructions/links for getting what you need to make this happen.

Or you could just get this guy [Link: logitech.com] and have it programmed as a source to every remote/touchpanel. You would press the "pandora" button on your crestron remote or touchpanel and use the logitech remote to control it.

It sucks to have an extra remote but since you dont have touchpanels everywhere anyway this might be a good choice. You will need to have a crestron programmer add it as a source. You will need to setup the PC & logitech server and you will need to make sure the controller is within wi-fi range.

I dont know how volume will work. You make get some adjustment with the logitech controller/PC or you may need to keep your crestron remote handy.