With my interest for the sd90 getting in the final stages..

- can you use the fs13 pedalboard with the sd90?
>>>AJ:- Yes.

Whats the quallity of the pedalboard
>>>AJ:- Very durable ... many pedals are out there going 20+ years!

And is there enough room between the pedals to prevent mistakes..
>>>AJ:- Depends on how wide/big your feet are but on average ... yes. :-)

- can you get a commercial powersupply as a backup for the official power supply.
>>>AJ:- Yes. Any 9V dc 400mA - 1200mA adaptor will work.

I plan to use the sd90 not only in my home studio with the kronos
But also in my living room for preparing and creating styles and performances..

-can you play styles and a midi file at the same time? (Just like on yamaha)