Hello,

What I have to do to hear the differences between close/paral and normal/retr?

Close: from one chord to another, the notes move to new notes as close as possible to the original note. C to F will give you C-E-G TO C-F-A

Parallel: from one chord to the other, the notes just transpose. C to F will give C-E-G TO F-A-C
Normal: easy to hear with the bass. When you change chords, the Bass continues its pattern.

Retrigger: The Bass replays the root each time you change chord (it interupts its programmed pattern)

Retrigger is very helpful with a pattern, say a waltz, that has a I-V bass line and you want it to sound the I at the start of chord change.