Matching slide transition lengths to audio track

I have a number of still photos that I want to run through starting and ending with a predefined audio track
Is there any way (other than trial and error) of adjusting the clip lengths so that they fit the audio?
In any case, when I try to adjust all the lengths with the clip editor and tick 'applies to all slides' it randomly assigns some lengths more or less around the number I choose (e.g. if I chose 3.2 sec - all appear to be between 3 and 3.4 sec, but many are different. I don't have snap to beat or anything on

The way transitions work is to borrow half the frames needed from the clip right before it and half from the clip right behind it. If some of your transitions are longer than this, it must add same frames. Also some transitions appear to need more frames than others.
Having said that, there is a way to get close, and you can fine-tune by trail and error. The trick is to convert everything to a common denominator, and for movies, that would be frames.
Since your name implies you live in Europe, I will give a PAL example at 25 frames per second.
Let's say you have an audio track that is 3 minutes and 23 seconds long. This would be (3 minutes x 60 seconds/minute x 25 frames/second) + (23 seconds x 25 frames per second) = 4500 frames + 575 frames = 5075 frames.
Now let's say you have 69 photos in your movie. Then each slide would need 73.55 frames. You cannot have .55 frames so round up to 74 frames per photo. You can enter the 74 as the duration, or you can convert it back to time as 2 seconds and 24 frames.
Note: if you are not seeing frames, but are seeing tenths of seconds, go into imovie Preferences and check "Display Time as hh:mm:ss:frames"
Another way to do this that can be very effective is to use the Beat Marker Feature of iMovie, and leave out transitions all together. Here is a [sample from Ian Parkinson|http://www.youtube.com/watch?v=_Crs1Mx92js]

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