I'm sure I am missing something here, but...
Construct 2 has lots of internal functions / object expressions which can be accessed, however I can't find detailed help anywhere about the internal parameters of the object expressions from the plug-ins section.
For example, let's take the expression 'AnalyserFreqBinAt', which isn't exactly intuitive! There are examples which help a bit, and you can access the expressions panel when creating an action, but the most I can extract about the usage are the name of the parameters: Audio.AnalyserFreqBinAt(Tag, Index, Bin).
The manual doesn't mention the parameters either, and just gives the following explanation: "Get the magnitude of an analyser's Nth frequency bin. Advanced audio must be supported, and an analyser effect already added to a tag."
How I am supposed to know what Tag, Index and Bin stand for, what is their range, what kind of variables are them? I'm sorry if it is already covered and the answer is right in front of me, but I couldn't find a handy and comprehensive command reference anywhere if not for the system expressions.