Developer Ultimate Sound Bank has just released a free ROMpler.
By all accounts it can play back sampled content and comes supplied with four instrument patches.
A Drum Kit and five REX2 loops.
Of real interest is the 415mb Soundpack Demo, which features dozens of sounds from Ultimate Sound Bank range of UVI soundcards.
You can of course load your own samples, which are automatically mapped across the keyboard.
There are a few catches(when it’s free, its sort of a given)
One is that it installs Pace iLok drivers.
Second it’s still in the beta phase of developement so there could well be some stability issues.