Ok... the crackling problem...

I have done some research into this and here are the possible solutions:

1) You have an illegitimate copy of FL Studio - go buy it (or search online for the registry hacks that fix the noise spikes - not that hard to find).
2) You are not allocating enough memory for the program.
3) You have not chosen the proper sound card in the Audio Settings menu or turned on sample buffering high enough (quick note - if you turn on sample buffering you must actually have enough physical memory (RAM) in order that FL doesn't kill your machine).
4) Turn off as much polyphony in the channel settings as possible to save CPU.
5) Despite what the Meter might say - that might not be how much of a load FL is putting on the CPU. Your CPU might not be able to handle everything.


Good Luck and God Speed.


p.s.

there are a few other alternative solutions, but these are the problems that I have encountered the majority of the time when working with FL (v3.0.0 - v7.0.0).