Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I suspect that you cannot do what you are asking about without a special switch added in, perhaps sound triggered, to produce the cutoff... or, of course, multi-channel editing.
What version of FL Studio are you using, please?
Thanks. I will research how to get done what you are asking about. There may be a way... but before I go do the research, please tell me whether you're running FL Studio on an Apple, or on a Windows PC? in case it might matter.
The only thing like a way to do what you want, that I can find so far, is to somehow combine the Channel Volume, and the snap-to or something similar, so that the Channel Volume (for all channels but drums' channel) will be suddenly diminished to minimal volume, in sync with the drumbeats.
You're welcome. If I can think of something else to suggest, I'll post it.
(Let me know what results there are from my suggestion, please.)