The general look and feel is great, but most definitely:
a) do it all in HTML - flash will make SEO impossible
b) the text is way too "crowded" due to the restricted length of the website (it has to "end" at the mixing board graphic).
My suggestion is to come up with a new concept. This looks nice, but content and design (as in useability/searchability) wise it's not good at all.
Lasse: if you want to gain clients through the website, think of the clients first. Make sure the website is easily findable via google (flash isnt!). Make the website as easily useable and readable as possible. Right now this is not the case at all.
To illustrate some points here:
Why do clients come to your website? What do clients want to know (in order of importance):
1) how expensive is it?
2) how does it sound?
3) what does the engineer look like?
4) what equipment does he have?
5) how can I reach the guy?
6) who has he worked with?
Most of that is not really adressed in the structure of the site. There is no "rates" section, I don't see a soundplayer page and if it's supposed to be somewhere in a sub-section: wrong! People don't have that kind of time/attention span. And even if they do: make it easy for them to find it by pointing out the obvious. If something says "References" like Jarkko's site, it doesn't automatically mean for me that I'll find a player there. Musicplayers belong on the front page of the site for any studio. So does a HUGE "get 10% discount by booking online" button that leads to the price/rates page via a "List of rates" link.
Get a cool looking shot of the owner/engineer. Nobody wants to work with a nerdy idiot. Lasse is a cool looking rocknroll guy who walks the walk, so capitalize on that. If the studio owner doesn't look rocknroll, it makes it harder to sell to a rock band. If he does - and comes across as a friendly dude, it makes a big difference!
Make contact easy! BIG email buttons. BIG phone number! EASY EASY EASY. Make sure to route the phone number it to a very friendly mailbox with a short text.
I think references aren't really that important. As in "naming" bands. Unless you work with bands like Andy Sneap does. But then you really don't need a website.
Also, unless you become really famous, try to make the website in "I" or "we" form. The 3rd person narrator form always sounds impersonal and it's really not needed. Small bands will want an accessible owner/engineer. Big band's don't give a shit who you are. The only people who might be impressed are gearslutz regulars. Again, think what the clients want. They pay the bills.
Oh, and why is there a link to MySpace? MySpace is dead.
Overall: graphics are good, structure and content are not good at all.