Drum replacer questions (or alternatives?)

Greetings all.. 
I have an old 4 track demo with some drums on it that I was hoping to "drum replace" and have been hitting my head against the wall. The track is actually drums recorded with overheads mostly.. We didn't have multitrack capabilities, many mic's, mixer etc back in my youth. We were fortunate enough to have a Yamaha 4 track recorder..
 
So the drum track I want to rescue is essentially an overhead.. and I've been trying to extract the kick/snare from it to import into some modern "remakes" of the material. I've watched tutorials and read info and somehow I can't get it to extract the part reliably. Most if not all the tutorials use mutli-tracked drums which are largely one drum per track and triggering the hits is largely a piece of cake. I just can't seem to zoom in.. I suppose I could manually "paint" the markers in for the whole track.. but that is very time consuming. So far I've tried using "EQ" to HPF, LPF and boost/cut to try to narrow the range to get Drum Replacer to lock in, but it's a messy result.
 
I was hoping someone maybe had some great tips or suggestions as surely I can't be the only person in Sonarland with this desire. I've tinkered with Slate Trigger and AD Trigger as well.. but haven't had any luck with their demos either.
 
Thanks!

I've done a lot of restoration work on old 4 track mixes and the flux in speed is possibly the worst offender (the capstan motors). however, you might opt to redo the whole drum track if its isolated.
You can use Melodyne to extract the tempo or if you can manually tempo map it, Which is a chore.
 
If your drum track is an ISO track (just the drums using that overhead you spoke off) you can probably extract some of the pieces using DR. use the filter knob to zone in the frequency's of each kit piece.
 
Like I said, if worse comes to worse, redo the track using session drummer or the equivalent.
Its a great way to bring old dull tracks to life.
 
 

Disclaimer: Drum Replacer is an awesome addition to Sonar but I haven't has much success with it.
 
So I took this for a spin: I opened a new project and imported a drum overhead track into it after trying to get Drum Replacer to track the kick for awhile with little success I thought I would give Addictive Trigger a shot. I loaded AT into the FX bin, set it to kick, engaged the Superstart, hit play and let it do it's thing. It finger printed and tracked the snare perfectly so I set the fingerprint to ignore the snare and I had the kick tracking perfectly.
I cloned the track and repeated the process with AT set to snare. No fuss, no muss, I got the snare tracking perfectly. I'm sure I could have done the same with toms but in true Monday fashion power went out to the building where I work so I had to tend to my day job.
If I knew a good way to replace Hat and cymbals I would tell ya. So far I like Chuck's solution but it takes creating a tempo map which is pretty easy: https://www.youtube.com/watch?v=M_SKmr_07Is
 
Rocky
 

Thanks for the report on Addictive Trigger, Bluzdog, I had been wondering about it. I've had pretty good success with Sonar's Drum Replacer but the Addictive Drums library integration is pretty tempting, I have a bunch of kits. I'll keep an eye out for a sale.

Thanks all... I'm actually trying to get the kick drum and the snare parts from the original overheads. I've tried with the settings in the Drum Replacer in Sonar and haven't gotten the results I was looking for. I was intrigued by Addictive Trigger.. but for some reason it didnt work in my project..  I was going to try Slate's.. but I read on the webpage somewhere that it really only could handle individually tracked drum parts (or thought I had read that)... 
 
I'll go back to Drum Replacer and mess with it some more. I've tried using the Pro Channel EQ to HP/LP various frequencies to try to eliminate the other drum sounds to let me hit the right setting for the drums but no luck just yet.. 
 
I'll keep at it.

TemplesGateStudio
I have an old 4 track demo with some drums on it that I was hoping to "drum replace" and have been hitting my head against the wall.

 
Interesting. But drum samples probably sound better.

TemplesGateStudio
So the drum track I want to rescue is essentially an overhead.. and I've been trying to extract the kick/snare from it to import into some modern "remakes" of the material.

 
From personal experience even isolated microphones can mistrigger DrumReplacer, requiring the occasional manual fix. Other drum replacers rely on algorithms, which sometimes fit, sometimes not. And not all drum replacers can output their result to MIDI.
 
Rebuilding it as suggested by chuckebaby is the way to go. If it's straight rock, it won't take long.

Sound Radix Drum leveler has an excellent expander. You'd probably have to copy the overhead and use two instances, one for the kick and one for the snare. It has a side-chain filter that includes or excludes certain frequencies. It's amazing! Hope that helps.