Despite my lack of indepth knowledge, i started out creating a list...
Seems the SD9PRO has everything the SD7 has except for
-Speakers
-Joystick (replaced by wheels)
On top of that the SD9PRO offers
-76 keys
-150 more sounds
-more drum kits extended drum set edditing
-700MB for user samples and sounds
-Live guitar riffs
-launchpad
while the Audya misses the nigty interface and some of the newer features as a player and the launchpad, and only max 256MB for user samples and no multi audio track player. it also has some things to offer not on the SD9Pro
-192 note polyphony vs 128
-not only drum and guitar, but also Bass, synth, pinao, percusion and more types of audio tracks..
-more external pro connections like sepperate audio outs and spdif
-real drawbar organ simulation
-full drawbar sliders
And the Ajamsonic adds to that
-VCE2 voices
-Huge amounts of content (sounds, styles, live drums and guitars)
-Arpeggio´s
There is probably a huge amount of things i forgot about, please feel free to add to this list...
Bachus...
1) On Audya the Audio Tracks is:
Audio Drums, Groove Percussions, Live Guitar.
The Bass, Synth, Piano etc its Midi tracks sequences...
However we can to use with
Style Modeling, (midi phrase "loops") of all this to make a new style without anything Record, but with Remix method we can to create a new style with:
1) Audio Tracks (Audio Drums and User Audio Drums, Groove Percusssions, Live Guitar)
2) Midi Phrases "licks, Arp etc" with Bass, Piano, El.Piano, Guitars, Strings, Synth etc, or typical Chords Midi Style Programming.
3) Midi Drums & Percussions (typical style programming parallel with Audio Tracks)
4) Different Mix in each variations/Fills, Breaks, End, Intros with different setting and Routing FX, FX Send Pan, voices ets (very very good)....
Its a very smart, useful and powerful method to create or to modified your styles....
Also on Audya dont can to create a User Drums kit with User Samples..
On SD9Pro we can...