The theory behind clipping the snare in a nutshell:
A limiter detects when a signal goes above a certain threshold (which you set) and then brutally yanks it back to be beneath that (hence the term "brickwalling", cuz it's as if the spikes are hitting a brick wall), whereas a clipper just cuts the tops off of those spikes, which can be bad on things like guitars, vocals, etc., but very very very good on anything with super sharp transients where we barely notice anyway (especially snares). So the philosophy is: since snares usually create sound spikes higher than any other instrument in a mix, they strain the limiter because it has to work to bring them back down, but since it's only working on the master bus, the rest of the mix suffers as well. However, if you clip the snare using something such as GClip, then it doesn't spike nearly as highly, and you can bring the volume up much louder with the limiter before it starts sounding horrendous because it's not working as hard to tame all those crazy snare spikes.
Thus, I put my first instance of GClip as the last insert on the snare track/bus, bring the snare track fader way lower than it currently is (so it sounds too soft in the mix), and then open up GClip, leaving the dynamics and clip knobs at their default positions (0% and 100%, respectively), and cranking the gain knob (also turning on 2x Oversampling). Watch the meters in the plugin as you play back your track, and just keep cranking that gain knob until there's some nice clipping going on, but also be sure to listen intently to make sure there aren't any artifacts creeping in (it's really hard to notice clipping on something with as sharp a spike and little decay as a snare, but crank GClip enough and you'll notice eventually!
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Then, be certain your master fader is at 0 dB (meaning, neutral), and put another instance of GClip on the master bus, using the same settings as on the snare track (except for gain, obviously), and turn up the gain just until you start seeing the spikes clip on the meters (be gentle here though, cuz the clipping can get a lot more noticeable since it's the whole mix going through it, and while you may not be able to hear clipping with your monitoring setup, that doesn't mean it's not there, so better to err on the side of caution). After that, go to town with whatever compressor/limiter/eq etc. suits your fancy! (however, I haven't experimented with the order of GClip in the master bus since I only use it and Voxengo Elephant on there, and I could potentially see it being better to eq before clipping, for example, or lightly compressing before clipping if you want a little ducking from the snare spikes).