Everything is fine with the performance trills, all in all there are six different up and six different down intervalls from minor second two major third. (all performance trills of all instruments do have these 6+6 intervall variations)
If you compare any trill performed with normal performance legato (only one up and one down variation) with the performance trill you should here the difference.
best
Herb
If you compare any trill performed with normal performance legato (only one up and one down variation) with the performance trill you should here the difference.
best
Herb