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This is just the best immitation of an organ sound! Does anybody knows if the the effect of jazzorgan (and the others too) uses octaves up or octaves down? If I hear it I would think it are only octaves up. I hope it are only octaves up because octaves down are bad for guitaramp speakers.

Both above and below is available, according to the user manual.

[em]1. Fat & Full- This sound adds an extra octave below and above to make your
guitar sound twice as big. Fills out any band in an instant! MOD Type:
Chorus.
2. Jazz- This preset has the cool, smooth jazz tone reminiscent of the late
great organist Jimmy Smith. MOD Type: Chorus.
3. Gospel- This preset has the upper octave drawbars added to capture that
great soulful organ tone. MOD Type: Chorus.
4. Classic Rock- This preset captures the classic rock sound of songs like
Procal Harum’s “Whiter Shade of Pale.” Add a touch of distortion for a classic
dirty organ. MOD Type: Chorus.
5. Bottom End- This preset has the lower draw bar sound. Perfect for adding
bottom to your guitar or playing B3 bass sounds. With the CLICK control up you can lay down a bass line like the one on Sugarloaf’s “Green Eyed Lady.” MOD Type: Chorus.
6. Octaves- This preset uses the fundamental tone plus one octave above. This sound is great for songs like Led Zeppelin’s “Your Time is Going to Come.” MOD Type: Chorus. CLICK control adds not only key click, but higher harmonics.
[/em]

But you shouldn’t be concerned about your guitar speakers. I have been playing organs (including my Hammond) through guitar speakers for years without problem and this guy ( http://youtu.be/4mW9b_KRedQ ) who probably did first, did it loud and for a very long time…