Once you let the VR Catalog acquisition run once through the iPod, you can set the VR Catalog Mode = OFF so it doesn't run every time you start the system. Voice commands will still be available. You don't need to turn it on again until you update the content/data on the iPod. The iPod Track forward/previous buttons are available while the VR cataloging is running, but no others.
Pg 145 of the manual
"Play the song/track" is not an available voice command.
Pgs 149-151 of the manual for available voice commands