I do have a contract with many pages of legal details covering definitions and contingencies, but not what I'm really interested in which is, what do I get at valuation $X.
Normally, you should first talk to the majority shareholders. Then talk to management, because they only act on behalf of the majority shareholder (I assume they are the same in your case). You could mention that it is your right to know. If they are still not transparent, try talking to a lawyer or somebody that you know has a similar contract in the same state and industry as you.
FYI: I am not a lawyer and this is no legal advice :)
The tricky part is whether the valuation number you have is what the company is paying to buy your company or if it's the overall value. If it's the overall value, then you need to subtract your company's outstanding liabilities.