A new sound for every white key makes a total of 70 sound effects. Check the demo to get an idea how they sound like.
It's got the macros for pitch, panning, attack, hold, decay, sustain, release and volume. No fx chain, so it can play in multiple tracks at the same time. It's almost 62MB so you wouldn't want to load it multiple times in your instrument list.
I think i like this version better, but i already released the larger version here if you're interested:
http://forum.renoise.com/index.php/topic/42287-30-xrni-alien-white-keys/?hl=%2Balien+%2Bwhite+%2Bkeys