in the trainer mode you can use arbitrary text files as callsign databases, one call per line.
As a source for such files, you might use the super check partial database (http://www.supercheckpartial.com/MASTER.SCP
) and cut out all the non-US or VE calls quite quickly (e. g. in Notepad).
Also CW Freak by JI0VWL offers a similar option: http://www.ji0vwl.com/cw_freak_net_e.html
Enjoying Rufz since 1997