Steven

WOW, you own all 3 keyboards? nice

as far as increasing tempo
you have to remember the Audya uses mostly Audio drums, REAL drums
that's why they sound so damn good
when you deal with audio, there is only so much you can speed it up, slow down, before it starts to sound "choppy"

so i'd recommend staying within 20% of original tempo, if you have to go more than that, then you probably picked the wrong style for that song, and there are probably other styles more appropriate (closer to your desired tempo)

i own the Audya4 (module), and want the Audya5 (keyboard)

if you decide to keep it over 30 days, and wanna sell it, let me know :-)

i guess the reason you never heard Ketron is because you are in USA, they are more popular in Europe,
and because Audya is almost impossible to see in any music store,

i mean you can't find one in Manhattan,NY go figure

with that said, i love Audya,

let me know what you think after you play with it some more, and compare to your Kord, and Yamaha