Modifying captured data

So let’s say I have a set of captured signals, but have a delay of “silence” between when I have started recording, and when I have performed the operation.

Is there a clean way to edit this out? Is there a visualizer tool, or some other application, that can convert Flipper files to waveform for editing/cleanup and output back to Flipper files?

I’m sure this has been asked before but I can’t seem to find it. Thanks in advance.