It isn't just Jamstix. As pointed out already, any VST or VSTi that uses tempo clock from the host simply doesn't work as far as I can tell with an older version of PTPA.

I like to use tempo-synced delay effects. The one I like to use in particular is a freebie called Bionic Delay. Instead of messing with calculating delays in mS, you just use the note value that makes sense - 1/8th, 1/16th, etc. If you change the tempo of the song just a bit, no big deal, the VST comes right along with.

That Tracktion deal also comes with a fairly complete install of Drumcore - which I'll be trying out probably first thing once I decide to install T3.

So, whatever it is in the coding of how PG products handle plugins with a midi tempo send, it just doesn't work. Jamstix is just one VSTi that needs that midi info to properly do it's 'Jamming'.

-Scott