There appears to be an issue in omitting dyads (chords) in the notation viewer when attaching attribute 'ped, as in this example:

 '((q c4 e3e4 ped) (q g3 c3c4 ped h e4 ped) (q  c4 ped g4 e4e5 ped))

Similar issues occur when using the attribute-series function:

(setf mat '((q c4 e3e4) (q g3 c3c4 h e4) (q c4 g4 e4e5)))
(attribute-series '((- 1) (ped 2) (ped 4) (ped 1))  mat)

 

A quick comment on my post earlier post.

 

When using the attribute-series function, the last dyad is not omitted, and the ped marking is attached and displayed correctly if there's a rest in the last measure. However, when there's no rest at the end of the last measure, the ped marking is not attached.

 

 

(setf mat '((q c4 e3e4) (q g3 c3c4 h e4) (q c4 g4 e4e5)))
(attribute-series '((- 1) (ped 2) (ped 4) (ped 2)) mat)
=> ((q c4 mf e3e4 ped) (q g3 c3c4 ped h e4 ped) (q c4 ped g4 e4e5))

(setf mat.r '((q c4 e3e4) (q g3 c3c4 h e4) (q c4 g4 e4e5 -q)))
(attribute-series '((- 1) (ped 2) (ped 4) (ped 2)) mat.r)
=> ((q c4 mf e3e4 ped) (q g3 c3c4 ped h e4 ped) (q c4 ped g4 e4e5 ped -))