Hypersonic 2 Full Ushfree -

It sounds like you're referring to by Steinberg, a now-discontinued but once-popular virtual sound module / workstation synth. The phrase "Full Ushfree" appears to be a misspelling or obfuscation of "full + ushfree" — likely an attempt to say "full + rush-free" or something similar, but more probably it's a cracked/pirated release tag (e.g., "Ushfree" as a group name or release identifier).