This is the code documentation of APEMoST, the Automated Parameter Estimation and Model Selection Toolkit.
You can find more information about it in its documentation.
Instead of adjusting parameters in files (which would cause a lot of unnecessary versions), you should pass the parameters to the compiler. This includes decisions on which algorithm to use, as well as fine- tuning values like number of burn-in iterations.
Do it like this:
$ CCFLAGS="-DN_PARAMETERS=3 -DDEBUG" make simplesin.exe
The possible parameters and their values:
Really, read the manual.