Most DAW's have a "split tool" that accomplishes what you are asking for. You might want to look into getting the cheapest version of a DAW, such as Studio One Artist for 50 bucks, and see if it accomplishes what you need.
The free program Audacity also has this function though honestly i've never used it so I can't vouch for how well it works. You might want to start there and see if it works how you want it to.
I looked up how LMMS works and it's similar to what I'm used to. You should use the FX mixer for your reverb instead of putting one on all your tracks seperately. Send the signal of the tracks that need reverb to an FX channel that has the reverb on it. That should let you then eq the reverb FX channel so that the reverb is cleaner for all the tracks you're sending to it. Probably not explaining that well but hopefully you understand.
It's been ages since I've posted here, mainly because I haven't worked on a remix in quite a while. I'm happy to say that's changed today! I just finished a remix of Aquatic Ruin Zone from Sonic 2!
Now, keep in mind this is a very conservative remix with some parts that are identical to the original, but I extended certain bars and added a little bit of a twist as the song progresses (and then repeats a couple of times). The reason is because this at first was just going to be a complete remake. And it was originally created entirely by ear, every drum hit and every note. This was not a midi rip. Eventually I got a little bit more creative with it, and the result is what you hear now - a very conservative remix with some moderate additions that I think make for a very nice, nostalgic, yet updated version of the song.
I realize because of how similar it is to the original version, it cannot be submitted. That's ok. Some day I'll make a wacky and different enough remix where I can feel it's worth of submitting.
Hope you guys enjoy this one! Feels good to be back making music again.
P.S. Any feedback on production quality always welcomed. Thanks in advance!