[chuck-users] STK shakers wrench rattling?

Hi, list! I'm having a bit of a problem with the wrench and guiro presets of Shakers; they won't rattle nicely. That is; they do for the first .noteOn() after the preset was set but after that the following noteOn's merely make them click. I tried all parameters in lots of permutations, I also tried to understand the source (which has lots of exceptions for these two) but it's beyond me and some of the comments look scary ;¬). I'm suspecting this isn't proper behaviour; sometimes messing with the .energy() parameter will get them to make some sort of noise but no nice rattles. Could somebody please comment on this? Yours, Kas.