I just did a search on this topic, both here at at cakewalk.com. I didn't get any hits here and the results I got at Cakewalk's website were not very helpful.
 
Here's the situation. In one of my mixes, on the drum track, which is MIDI and not audio, I'm getting an annoying cymbal ring -- just loud enough to be annoying. I've more or less pinned down the frequency to about 4k. I can't get any closer than that with the tools I have available. Unfortunately, none of the equalizers I have are capable of getting rid of that specific frequency. And I don't see anything like a notch filter with the tools that are included with SPlat.
 
As a last resort, I tried different drum sets, but they all have this ring.
 
So I'm wondering if there's a plug-in out there that you like that hopefully doesn't cost all that much. If there is, care to share any info on it?
 
Oh, and I'm trying to apply the notch to TTS-1's channel, so I have access to audio effects. I know there's nothing for MIDI that's gonna do what I need.

The biFilter2 has a BR Tight preset but any parametric EQ should work. If one band of the Sonitus EQ is not enough stack them. For a third party alternative, MEqualizer in the the MFreeFXBundle has a notch filter type.

QuadQurve can do wonders in that matter too.

the Sonitus eq can do this with a tight Q setting.
 

The Sonitus EQ can be a notch filter, as tight as you want it. As scook suggested above, 2 or more filters can be stacked to increase their Q factor. Have a look at the "telephone" preset for an example.
 

+1 for stacking filters, but what concerns me about the OP is "trying different kits and getting the same thing." That comes across as very odd (either the VSTi or your signal chain has something in it causing this)... also, I am not sure if a shelf is a better answer since it may not be as isolated as you think.
 
As an aside - to find such a thing, an "audio microscope" is easiest by using a parametric EQ and jacking the Q and Level to maximum, then sweeping the frequency knob during playback. If truly isolated, then knocking the level down to some reasonable negative level (minus 2-3 dB) and widening the Q a smidge on that same frequency will often suffice.

mettelus
+1 for stacking filters, but what concerns me about the OP is "trying different kits and getting the same thing." That comes across as very odd (either the VSTi or your signal chain has something in it causing this)... 

If different sample sets are exhibiting a similar ringing at the same frequencies, unless they were recorded in the same room, through the same signal chain, and with the same mics, this sounds like an issue with the playback system. i.e., soundcard, monitors or headphones, or a plug-in on the channel or a bus. (or ears, tinnitus, etc.)

That 4K hit is is nearly every ride cymbal I've ever worked with - hence the reason why changing kits it's still there. 
 
I agree with the others that the sonitus eq (which has been in Cake for a loonnnnnng time) or any parametric type of eq should work.  From experience, you'd likely be better off with a 10-15 q ratio to get to the ring 'area'... though you should be able to noodle around that to get what you want.  If you notch it too heavily it will come across 'odd'.  
 
Good luck!
 
 

It's also worth noting that oaksound soothe is largely a magic resonance suppressor that works on just about any problem source but is a tad on the pricey side.

What randyman said. It's clearly a ride cymbal's bell, and that's the reason why all sets share it, I'm convinced. To be honest, I'm not trying to eliminate it. I just want to damp it down somewhat. I don't ordinarily object to that sound -- in fact I actually like it. But I like the sound when the drummer is pinging it with some authority. But the way it's being used in this track, it's so tentative, it's borderline annoying. I suppose one option would be to go into the track and edit this "note" -- jack up it's volume a ways.  Although that may alter the character of the drum track in ways I won't prefer. I'll have to think about this some.
 
Thanks for the tip on the Sonitus EQ. I'll see if I can get it to work.