Welcome to Music Banter Forum! Make sure to register - it's free and very quick! You have to register before you can post and participate in our discussions with over 70,000 other registered members. After you create your free account, you will be able to customize many options, you will have the full access to over 1,100,000 posts.
There is no actual transfer of files from the spd-S to the spd-20. But what he means is, he uses midi to trigger the spd-s from the spd-20. it is a great way to extend the life of your spd-s.