Portamento mode went awry in the last couple of releases because I tried to add variable slide rate without properly testing.
Version 2.65j improves the behavior significantly so that the slide rate across the keyboard is variable to get the time from note to note to be relatively the same regardless of distance between notes. The timing is not yet perfect but I wanted to let everyone know that 2.65j is definitely worth a look if you want improved portamento mono mode.
At this point, the note on/off behavior is as good as it's going to get with no note (FIFO) buffering.
I would appreciate feedback from those of you that used portamento mono mode. Because working on it is very time consuming so if it works well enough in this version then I am inclined to leave it alone for now. If there is some glaring problem, please do let me know about it.
/Mike