Robh and jazzmammal,

I know you guys have Jamstix. Have you ever got it to simply play along with a PG track?

If so, then you might be able to make it 'Jam' by automating the jam level. I did this recently in a song I knocked out a week or so ago for the FAWM challenge. It wasn't jamming along well with the audio, so I simply drew in the jam level with automation.

Here's the result: http://rockstarnot.rekkerd.org/fawm2009/Scott%20Lake%20-%20Lunch.mp3

Note that on the first verse, the snare gets replaced with a side-stick, etc. Verse 2, I dialed up the jam level.

This might actually work in PG products.

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