minstrel: Medieval French

[Sandi Augsburger]

I was wondering what kind of French would have been used in Dunstable's 
time. We are singing some music and we are not sure whether to pronounce 
all the consonants, or to assume that many of them would be silent as in 
modern French. Would the 'ai' be ay? Would the 'oi' still be oy? For 
example, how would the word 'dictz' be pronounced? Would the s be silent 
in puisque?
Do any of you know of some websites that have information on medieval 
French? I used to know all this stuff, but it's been a long time since 
college!
Thanks!
Sandi in Idaho