So you want it to be pretty tight? It is all in the timing! right? I say this as there a few ways to do this and some, but not all, can depend on OS of course.
I will tell you one way but it depends on tempo being set, as opposed to the other methods, but can be done in any MPC. Only cos your not using patched phrase or have it chopped right. So its all in the timing, so therefore, you just have to time it right. Its pretty obvious I know. So all you gotta do is put the riser start in the right place and time stretch it if you have to. I mean thats how its always done.

like you have to make sure samples match tempo otherwise...... well some people might go for out of time stuff, but not me or you. Reverse cymbal is exactly the same, just put it in the right place and it works. I mean you hit pad near end of sequence and tweek in grid edit/step edit till its right. So it goes woosh and ends with sequence, like you want. But there is a few tweeks like pitch shift /time stretch. Do this and you can chop change sequences with no problem and all your sweeps and reverse cymbals will work as before - till you change tempo of course as samples are not patched phrases or chopped. So like i said this is the old way, that means you gotta put some work into it but its kinda stuck at a tempo but it works. unless your gen Y maybe

well just remember that the hits are usually earlier in reverse, or you can easily add silence to end of the sample to change the timing, that is another old trick for reverse as it is usually coming up from 0dB, so more 0dB is no biggy. depends on sample ect of course. like say if you want to keep pitch then time stretch, or if its noise then pitch shift it as its not as pitch orientated so to speak. So that is a few things to try that you can do on any sampler/sequencer. I actually use these methods as I do not use DAW, and can do it pretty well most times, and can not be bothered to actually patch phrase a riser, or cymbal, as I have done before, and the above methods worked for years and it works for me. If you make a patch phrase instead, then it will always work in what ever tempo, but chop on transients is hard on riser, as it has none really. In this case I would use autochop on high level to get it real smooth if you go this method.
Another consideration is FX. hit stop when there is a reverb or delay, and of course you will hear the tail ends of the FX after you stop. Use FX change to get around this if you really want dead silence and you are using a reverb or delay which stops the dead silence happening or change you want. something to consider anyways and good to be aware of.
Also JJOSXL has mutes that act on one shot samples so that stop and mute will be immediate. Go to OTHER Screen, hit F2 MISC, make sure Mute/Stop is set to immediate. Use mute to make everything you want to mute, mute. Or solo some blank track instead. this way you will mute the track with riser say and use same track on each sequence so that way as you mute and change tracks it will stop straight away like you want it to. so you could make mute event on start of next sequence so as it changes it cuts of sample riser/cymbal when it changes to mute. then take of mute for start of riser/cymbal.
Some people use other ways such as to make a ghost hit (very short sample, velocity 0 so you do not hear it) and put it where you want a mute and it acts as a mute on the chosen sample in the same mono program. like copper tony just posted as i wrote this