Oh my, there are so many differences between the two!

1. Build quality - aluminum(3x) vs plastic(900)
2. Controllers, sliders(3x)
3. dedicated outputs(3x)
4. Top line vocal harmonizer and XLR mic preamp(3x) vs LOW END mic pre/harmonizer(900)
5. More USB slots(3x)

just to name a few ....
smile
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