Watch the Symmetrical Dim Scale Application online guitar lesson by Bruce Arnold from Total Modal

Symmetrical Diminished is a very useful mode and students usually find it an easier mode to hear. Once again it's an 8 note mode and it can be played over a Dominant chord vamp. Notice with this mode that if you play any group of notes that work with the mode you can move those notes up or down in minor 3rds.
The Symmetrical Diminished Mode has no avoid notes.
STUDY TIP .....
Modal sequencing is playing scales in different patterns. For instance you could play a scale in ascending 3rds. If it was a C major Mode you would play the following notes:
C,E,D,F,E,G,F,A,G,B,A,C,B,D
There are many ways you can use modal sequencing to find new melodic ideas and greatly improve you technique. Future volumes of Total Modal will explore these ideas but I also recommend you check out the New York Guitar Method Volume One for a detailed description of Modal Sequencing.
Articulation is extremely important to playing any melodic line. Future volumes of Total Modal will look at how to apply different types of articulation. You can also find an in depth look at articulation in New York Guitar Method volume One.
Approach notes are chromatic notes that resolve into scale steps. Future volumes of Total Modal will explore these ideas but you can also get a detailed look at Approach notes in the book New York Guitar Method Volume Two.