Sparky,
About a year ago I had the SD2 module but in combination with my Korg PA800 I found it added little. Never tried it with my recent PSR750 which might be worth the effort. I checked on its successor the SD1000 which apparently is only hitting the market here in Europe this very month. Something perhaps to bear in mind.I still am in two minds about what to do. Either keep things the way they are, after all I am quite content with my Korg PA800 and the PSR750 has some great right hand stuff. On the other hand I might be tempted to get a G70 +Ketron SD1000 instead of the yammie.
regards,
John