I understand you are talking about 3 bands crossfaders and not 3 channels – individual crossfading for “lows”, “mids” and “highs” (similar to that Pioneer mixer, cant recall the model)
If so, Its fairly easy to set up one….
Create 3 send tracks ( the ones that are named “return” in Live)….Insert linear EQ effect in all three of them. Ableton’s own EQ 8 can do the trick.
Rename these tracks to “low”, “mid”, “high” in order to see where you are at.
In “low” go to the EQ and apply a low pass filter – choose the frequency to be close to what you’d like to be your “lows”…Note the frequency specifically.
Go to “mid” send track….apply a high pass filter with fequenct and Q exactly the same as the low pass of the “lows” EQ. Also enable a second filter on the EQ and apply a low pass filter to where you d like your “highs” to be cut off.
Go to “high” send track – apply a high pass filter on the same frequency and Q you set the “mids” low pass.
If you are following we have created 3 send tracks, each one allowing certain “bands” of audio spectrum to pass through, named “low”, “mid”, “high”.
Create two audio tracks, “Audio track A” and “audio track B” and make sure you configure their outputs to “send only”. Configure your midi controller mappings so that a fader’s movement causes “audio track A” send 1 level to rise and “audio track B” send 1 level to lower and vice-versa (done by setting the min and max values in mappings reversed in one of the tracks, preferably the second one) – this will be your “low” crossfader.
Do the same for send 2 and send 3.
The end result is two audio tracks (your decks), and three band crossfaders, “low”, “mid”, “high”.
This is just one way of doing it – it all depends on how you want to organise your set actually.
You can also go crasy afterwards and apply effects to only specific bands, since they remain seperated in three distinct send channels – delay in hi hats only anyone? 😉
