Testing the function to skip back in time I found that Portamento needs a note to affect the sound of another note, it makes it vary in pitch over time, if I jump right after the first note this doesn't happen. attached file (channel 3).
B3 05 50
B3 41 7F
93 24 16 -> If I skip this note
83 24 40
93 54 7B -> This note sounds different
93 13 20
83 54 40
there are more events but I don't think they are relevant to the example
Shouldn't this be done with Portamento Control?
Or are they different things?
Are there more controls of this type? I mean that a note alters the sound of others