Can't hear Roland JV1010's sounds in Garageband

Thanks a bunch, Keith. I am beginning to see now from the GB side of things. I hadn't considered its midi out capability. I wonder if I am trying to get my keyboard to talk to the Roland module in the correct way.  Normally this is where a MIDI cable would come in I guess… MIDI out from the keyboard to the MIDI input on the Roland (if I understand correctly). However, my DGX-660 only has a USB out on the back. I have connected the keyboard to my laptop in order to get the MIDI data from the keyboard into the laptop, and then I've tried sending it back out through the Focusrite, which has standard 5-pin MIDI on the back. I've run a MIDI cable from the Focusrite to the Roland. No dice! Maybe my set-up there was too complicated.

Do you think I need a 3rd party midi host? They are rather expensive, but I'd love to use this sound module. Thanks in advance for your help.

Thanks again, Keith! I understand now and will look into Logic, as it sounds like it has the capabilities I need. Thanks for answering. I had been to Yamaha and Sweetwater Customer support, and while they could help with set-up and hardware, they wouldn't have known that GB was my limiting factor for sound-module use.