@Pav
1st - at the first corner, left hander just after you join from the pits. It's on the inside left, so keep as far right as you can.
2nd - about 3/4 way round the track. Get to the end of the straight and you'll do a tight left hander. Then there is a sweeping right. Mic is on the inside of corner, on your right.
3rd - There are 2 left handers after the 2nd mic, and you'll notice a high bank on your right hand side as you go down a short straight. The mic is on your right. Swerve as far left as possible to avoid, then get as far right for the hairpin left (obviously watching out for other cars).
4th - on the last straight before you head towards the pits. Mic is on the left. Again, swerve as far right to avoid, then back to the left for the end of the straight and the fast right. Watch out for cars, as cars behind might think you are swerving right to let them past.
I've found that by avoiding the mic I can keep the hammer down and not get flagged. They are absolutely stupid rules, as it makes driving sooo much more dangerous, having to swerve to avoid mics.
If you are attending with Javelin, they will tell you in the briefing that you only have 1 chance, and that as soon as you get flagged for noise you are going home. The marshals are however a lot more pragmatic, and as I've been twice and been flagged for noise twice and continued with the day both times, I think it's safe to assume you have 1 chance. I have, however see people going home about 10am!!
I'll try and get a pic of the mic locations.