Well I've only been playing with the thing for a few minutes, but have already found a really interesting application...I figure I won't be alone, so it would useful to consolidate the Drum Replacer-related tips in one place. Here's one...
 
Drum Part Creation Instead of Replacement
 
I took a simple eighth-note tambourine pattern with an accent on the beat. Set one threshold to catch only the accents, and triggered the kick. Set the other threshold to catch the 8th notes and triggered a tom. It gave a cool Bo Diddly kind of tom-tom beat. So then I added snare on 2 and 4, and pedal hi-hat on the offbeats to complete the part.
 
 

Okay, here's another one, more twisted this time...
 
Hard Rock Hum Drum
 
The TR-808's "hum drum" sound is something you get by tweaking the internal trimpots for the maximum decay time short of self-oscillation. I'm sure you've all heard it when waiting at the light and the car next to you was almost having its doors unhinged from the kick, or if you've spent any time at clubs.
 
So...take a sample of a decaying sine wave, and trigger it off an acoustic kick in a hard rock pattern. Now you have a sick hum drum acoustic kick. I played this for a drummer friend and he just about fell off his chair 

Cool! will be testing hits tomorrow

Thanks Craig, very cool stuff indeed!!!
Nice to see tips like these coming out......

Here's another one...
 
The Drum "DJ Crossfader"
 
The Wet/Dry slider at the top is very cool for crossfading between the original clip and the replaced sounds. Unfortunately, it's not automatable...however, it did show me the merits of copying the drum track you want to replace so it's separate from the replaced track, and you can do this with the standard automation.
 
It's really a very interesting effect to morph between two different sets of sounds with the same part. It would not be possible to pull this off convincingly without the zero-latency aspect of Drum Replacer.

Make your own SFZ file with a multisampled instrument and place it in the Drum Replacer content library.
Load a dynamic drum set so you can choose different peaks and frequencies.
 
Load the multisampled SFZ in the three Drum replacer modules.
 
Set the first one to replace some drum content, pan it full left, and set the MIDI note appropriately.
Set the second on to replace some other drum content and pan it center and set another MIDI note for a chord.
Do the same for the third.
 
Now you will get a panned chord with a unique instrument in sync with the drum track.
 
I think the MIDI note in DR should be extended to full range, not just the small subset it now has.
 
 By the way, no need to use this on drum tracks only. You might be able to slice up other instrument parts and clone in new sounds.
 

When you hold the mouse on one of the filters, you will hear a metronome beat at the filter frequency instead of the track sound. That helps set the pitch detection.
 
There's only MIDI notes 35-50 available for the MIDI conversion, though.
 
It would be a great future update to have a lowpass and highpass filter setting on each lane.
Also a low and high dynamic range marker instead of just a peak detector.
Then a full-range MIDI note replacement instead of the small drum subset.
Finally, ability to add more lanes not just the three.
 
That will allow a surgical dissection of the sound and a quite general replacement function.
 
Spectral slicing and reforming.
 

Anderton
 I played this for a drummer friend and he just about fell off his chair 

See, this is the problem I have with drummers all the time.

Yeah... They're always falling off chairs!

arachnaut
Make your own SFZ file with a multisampled instrument and place it in the Drum Replacer content library.
Load a dynamic drum set so you can choose different peaks and frequencies.
 
Load the multisampled SFZ in the three Drum replacer modules.
 
Set the first one to replace some drum content, pan it full left, and set the MIDI note appropriately.
Set the second on to replace some other drum content and pan it center and set another MIDI note for a chord.
Do the same for the third.
 
Now you will get a panned chord with a unique instrument in sync with the drum track.
 
I think the MIDI note in DR should be extended to full range, not just the small subset it now has.
 
 By the way, no need to use this on drum tracks only. You might be able to slice up other instrument parts and clone in new sounds.
 

This is VERY interesting to me - how does one can make an SFZ file with a multisampled instrument?  And once placed in the Drum Replacer content library, what capabilities would you have within the Drum Replacer? 
 
For example, if that multisampled instrument contained a particular sample, for lack of a better work, of a snare hit, could that be loaded into the drum replacer as a Drum Replacement sound/element, i.e., to replace a recorded snare with a sample from the converted-then-imported sounds of the multisampled instrument? Or am I in another universe here?
 
Thanks, arachnaut, I know you're one of the tech/software gurus here, so forgive my ignorance.  I just have so many multisample instruments I don't use - but would, if I could use their samples/sounds in SPLAT's Drum Replacer.