The Dimished chord is very often misunderstood or used in properly. Joe Pass, a well-known jazz guitar player calls it a transitional chord, he uses it to get from chord to another. When used in this manner – C7 C7-9 F6 it adds so much to the sound to the chord progression.

To get the full value you must use fingered chords. One note changes from C7 to C7-9 --- C note to the C# leading you to D the 6th of the coming F6 chord.

John C.

Will this make you sound much better –No! It just adds a little flavor.

Hi John,
Yes, of course you have explained it much better than I. Transitional is the word I was looking for.But I still think "better" than "flavour" IMO.
Ray

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Ray The Saint