They should be, if you try it this way:
- Route the snare sample into a Delay bus.
- Route the Delay bus into a Reverb bus, if that is how you wish to do it. In that case, unroute the Delay bus from the Master track so that the only processed Delay signal is reverberated.
- The Reverb bus should be routed to the Master track as usual.
To be sure that this works, try lowering the Dry signal mix inside the Delay plugin to 0%, and then max out the Feedback level. The "Dry signal mix" is the far right knob, and allows you to control what percentage of the output is the dry signal.
(I currently have my cursor over the third knob from the left on Fruity Delay 2, next to "CUT", which is labeled the "Feedback level" on the upper left of FL Studio.)
This sounds like this:
Alternatively, you could max out the Feedback level and keep the Dry signal mix as the default, but lower the Dry signal input level (second knob from the left on Fruity Delay 2). Then, the first hit would be louder than the delayed hits afterwards, and the delayed hits are still reverberated, since the "Dry signal input level" allows you to control how loud the input signal is.