Noticed the following and don't how to determine where the error comes from.
Sonar 8.5.3 & ARIA (latest update):
Suppose a pizzicato note on Sonar's timestamp: 24:01:000
Suppose the keyswitch on Sonar's timestamp: 23:01:000 AND that keyswitch (F1) has a duration of exactly 1:000 then the next note on 24:01:000 (which should be pizzicato) is not played at all.
It also involves other keyswitch values, when placed before the actual note and with a duration as such that the keyswitch duration is adjacent or overlaps the first note, then this note will not be played!!!
I have automatic legato on in ARIA.