I've been messing around with SD40 I bought from Don. Thanks to him, I probably never would have been able to purchase this incredible machine on my own. Don Mason...Thank you so much!

I've discovered this multitrack option on the SD40. We discussed it briefly with the SD 7, but I see now what an amazing feature this is. I've included a sample to show what can be done. It must be the same technique used for Amazon's Music commercial featuring Whitney Houston.
JM