If you’re happy to enough to host a VST plugin then you can get a really nice free steel/metal drum virtual instrument from Ample Sound called Cloudrum. Probably available from a few places, but got mine from Pluginboutique as I’d already registered there and there’s no license needed for the plugin itself at all. The download page is here, and their free guitar and bass plugins are worth picking up too, they do some pretty nice modelling.
