How to Play Double-Stop Boogie with Rich Appleman and Danny Morris When you play double-stop, you have two techniques to choose from, like strumming two post strings at the same time. You could also play this by strumming 2 adjacent strings. Tritone means three tones. Try to slide in and out of the tritones to make a nice sound on the base coupled with an open string. Couple it with a nice chord, you can now play the double-stop boogie.