Shim,
I received your email regarding the 500 vs 800. I have to say, the 800 is MUCH more advanced than the 500.
1. Deeper processor sounds
2. Color screen
3. HARMONIZER
4. After touch
5. Better build quality
6. Marvelous 'blue' LOL
7. And probably a lot more than I know off the top of my head
I wouldn't waste my money on the 500 if you can get the 800 for a little bit more.
Just my thoughts and good luck
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Yamaha 920 / Yamaha Stagepas 100 BTRs / Senn e935 - LIVE
Roland RD 2000 / Tascam DP24sd / ATEM switcher - STUDIO