[Andy Taplin] “I don’t know why M100 have made this so difficult?”
If you mean “why is it so hard to apply an effect to multiple clips,” well, if you can suggest a simpler procedure than the one Greg gave, please do.
But if you mean “why can’t I apply dynamics to synched clips,” it’s because applying a dynamic effect to a stereo clip is not the same as applying the effect to two mono clips. Most people use pairs of synched audio clips for stereo, but Media 100 i (and HD and sw) internally treat each audio track independently, so it isn’t possible to correctly apply the effect in stereo. The designers illustrated that by not allowing dynamics to be applied to synched clips.