On januari the 4rd the same question was asked on the PSR-Tutorial forum. The 4rd reply gives the solution:
http://www.psrtutorial.com/forum/index.php?topic=1467.0

A1 Fingering - gives a single - full note (get there through "function"_
Top down 1 octave
Initial Touch "off"
R1 - Pipe Organ
R2 - Pipe Organ - or any other for variation (I like Tibia 16 + 4)
Left - "on" or "off" (I don't think it matters)
Volumes: Left, R1 and R2 I put full at 127

This gives a very full pipe organ - and the slight "tweaks" on R2


Bert