Controlling midi volumen of a long note

[Pablo Cordal]

Hi,

When a long note is sounding and there is a rest afterward, the note
abruptly quiets down, which is awful.

I have several staves so controlling the general MIDI volumen is useless. I
need to control the volume of one staff or the volume of the note.

Is there any way to meke the MIDI volume of that note drop gently at the
end?

Thank you very much and best wishes