Okay... I just rewatched the vid and typed up a step by step. I'm going to post it here because considering how much Craig shares by way of his "Tips" threads and what not I'm going to assume he does not mind that I post an interpretation of one segment of one series.
HOWEVER... say the word, Craig and I will delete this post immediately. Any corrections or observations on my (potentially flawed) pontifimications are of course welcomed by me and I'm sure anyone reading.
This following is based on the segment that appears in "Sonar X1 Advanced Workshop: The Next Level (by Craig Anderton)" from 48:20-52:40.
This is also how I create my own personal notes for specific procedures I dredge out of such vids and tuts when I think I may want to try them out. This is a little more finely edited for the forum but I have reams of these things with time codes or links to online resources that go from general descriptions to revisit up to full on step by steps like this. lol... I may be insane. This will actually end up in my notes.
Cheers.
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1) Create Track 1 and import stereo mix into it.
2) Insert LP64 Multiband Compressor (or another multiband compressor/tool that allows you to mute/solo frequency bands like the Sonitus Multiband)
3) Solo the lowest band so only the low end is audible
4) Adjust the band freq range to allow the bass through (he sets to approx 130hz. Note: You could probably do a bandpass type filter to just snag the main bass freq... so use the lo-mid filter instead of the low filter and set the low/high boundaries to the right freqs. He does not say that though but it is what I would try if I was trying to work on a bass part from a stereo mix.)
5) Make sure none of the bands are actually compressing or applying any effects. You want the signal completely unprocessed. It is just a freqeuncy splitter. (In the LP64 he does this by clicking the "All" button and using the following settings:
Threshold = 0.0db
Ratio = 1.0
Gain = 0.0
6) Save as a preset (he names it "No Compression" but "No Compression Lo" or something like that seems better. That way you can save the second instance of LP64 that you are about to create as a distinct preset for easy loading of both).
7) Clone the track (with Clone: Effects/Properties/Effects/Sends selected in the Clone dialog window)
8) In the newly cloned track's FX Bin/Rack double click the LP64 to open that track's instance of LP64.
9) Load the "No Compression" preset (this does not seem necessary because the cloning should have already loaded it... but I'm just typing what is shown in the vid).
10) In the LP64 turn OFF the Solo button for the low band and then solo the rest of the bands. This effectively reverses the freq range being allowed through. So Track 1 has only the lo freqs audible. Track 2 has eveything EXCEPT the lo freqs audible. If using another tool or using a bandpass just make sure that on the second track you invert whatever signals are being allowed through. In other words...
Track 1 = Only low band is heard
Track 2 = Everything EXCEPT the low band is heard
11) Double check to make extra sure NO compression/effects are being applied on either track. Do this by soling both tracks, listen. Then solo ONLY Track 1, turn off the LP 64 and listen. The outputs should be identical. Essentially playing back Track 1 without the LP64 (or whatever you are using) is your raw stereo file. Soloing both tracks with both track's LP64 (or whatever you are using) should be giving you the exact sound as the raw stereo file. In other words...
Track 1 - LP64 = Raw file
Track 1 + 2 + LP64 on both = Raw file
If they sound different you did something wrong. Check to make sure no effect is being applied by the LP64 (or whatever you are using).
12) Set Track 1 Interleave to = Mono
Now all the low frequencies are centered (bass, kick, etc) getting them out of the way of the higher frequencies in the stereo field.
You can now use Channel Tools or other similar plugins to spread the stereo image of the higher frequencies is desired.
You can also use the Track 2 instance of LP64 as an EQ to increase/decrease the lo-mid/hi-mid/hi bands as desired without compression by increasing the Gain on the bands. Or you could of course add compression to the bands. For the Lo you COULD use the LP64 controls to increase the Gain but just turning up the track fader would (should) have the same effect.
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Sonitus Muliband has slightly different controls for band separation as I'm sure the Melda products do so the process may be slightly differnt but the gist is isolate and separate and make sure that between Track 1 and Track 2 NOTHING is being excluded or doubled up. You want the exact same output as you would get from the original stereo file. THEN monoize your lo end.
I personally would try doing the bandpass thing to get at just the bass and add extra processing to the bass itself instead of the entire lo freq band (but monoizing the whole lo end might be a good idea anyway).
Just some interesting stuff to try.
Cheers.