I am home now and played around with the organ flute section of the PSR3K.
There is percussion and keyclick.
Under the footage tab there are "faders" for 16',5 1/3',8',4', 2 2/3' 2' 1 3/5' 1 1/3' and 1'. They are the normal organ sliders.
On the next tab there are three more faders with 4' 2 2/3' and 2' Those are percussion sounds, in a way that there is an attack and the tone fades away immediately. The decay time is handled with a slider called length.
So the idea is to make a sound with the sliders on tab one, and add the percussive footages on the second tab.
Keyclick is always there on every slider and the clickeffect can be changed with another slider in this section called RESP(once).
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drdalet