How can I change the velocity of one note throughout the song in my MOXF6 sequencer? There may be the "JOB" for this function? How do I configure it properly? I need to change the velocity of the kick drum only.

Yes, this can be accomplished within your MOXF sequencer. You do this with a combination of the following JOBS:
EVENT Job: Extract Event ... to remove all kick drum hits to an empty track
NOTE Job: Modify Velocity ... to increase or decrease the velocity of the extracted data
EVENTJob: Extract Event ... to reassemble the kick to its original position/track.

Here is the step-by-step
Select the Drum Track
Press [JOB]
Press [F3] EVENT
Select 04: Extract Event
Set the Measure Range to cover the entire SONG, as necessary.
Set the TYPE of Event = NOTE (this is the default)
Cursor down and set the NOTE you which to extract (example: say the Kick Drum is "C1")
Cursor down set Target to an empty Track (example: say track "16" is empty)
Press [ENTER] to execute

This moves all the "C1"s to Track 16
Select Track 16

While still in JOB
Press [F2] NOTE
Select 02: Modify Velocity
The Measure Range is already set.
Verify the Track # (16) the one you targeted for the extracted Kick Drums (C1's)
You can "Set All" to a specific velocity value -or- you can increase by a certain "Rate" (percentage) --or-- you can "Offset" the value by a set amount... Your choice
Press [ENTER] to execute

While still in JOB
Press [F3] EVENT
The Extract Job and the Measure Range are already selected and setup from your previous use... Set the Track to the one containing your Kick drums
Set the Target to the original Drum Track
Press [ENTER] to execute.

This will allow you to accomplish your goal. If all your tracks are used (ie, you do not have an empty track) - you can transfer the entire DRUM Track to an empty SONG or PATTERN and do the same thing, before putting it back where it came from.

:p :p :p :p :p
Thank you so much, BM!!!
It helped me a lot!