I did what you said. Now have a 4GB SD card installed, made a 2GB file as described in the thread you said I should read.
I tried to download and install amarok again but got a message to say that amarok is up to date. (wording may not be 100% correct, as I'm working from memory now). This suggests to me that amarok is installed...somewhere.
Did some research and dowloaded/installed a utility that lists all your installed applications. Amarok doesn't show up on the list.
I give up.