[Harp-L] Aebersold Chord Notation Questions

[Elizabeth Hess <TrackHarpL@xxxxxxxxxxxx>]

I just got Jamey Aebersold's "Autumn Leaves" play-along book.  There  
is a chord symbol here that I don't know how to decipher:  It's  
Eb<triangle>+4.  I've seen the triangle before, and take it to mean  
major 7th.  And I would think that "+4" means augmented 4th.  So,  
would the notes for this chord be Eb G A Bb D?

There is another measure where the "+4" is in parentheses,  
Eb<triangle>(+4).  What's the difference...?

In the last measure of the coda there is G - <triangle>  Would that be  
a G minor triad with a major 7th on top, i.e. G Bb D F#?

There are numerous instances of a chord letter followed by a zero with  
a slash through it, which I've been interpreting as a diminished  
chord, but here, in the song, "Witchcraft" we have both a zero with a  
slash through it AND a little circle that looks like a degree symbol  
(as in Fahrenheit or Centigrade, in other contexts).  Is one of these  
diminished, then, and the other something else?  And what would the  
something else be?

This is my first Aebersold book.  It's Volume 44.  Maybe there's a  
legend in Volume 1?  (That book is on order, but hasn't arrived yet.)

Thanks in advance.

Elizabeth (aka "Tin Lizzie")