There are many reasons you may want to split the frequencies of a sound. Perhaps it is a bass or lead and you would like to apply separate effects to each frequency range. Maybe you are trying to extract a certain part of the sound, or tame some unruly harmonics in it. Whatever the reason, there are a few ways to go about splitting the signal. The simplest of which is to simply make three chains with three EQ8's, but this leaves a small gap and related attenuation where the crossover points are. The better way to split frequencies is by using phase relationships. The following is a step by step guide to creating a three band phase splitting rack. This is an extension of a technique that I learned from a Mr. Bill video tutorial.
Step 1: Create Audio Effect Rack with three chains.
Step 2: Setup Low Frequency Chain
Step 3: Setup High Frequency Chain
Step 4: Setup Mid Frequency Chain
Step 5: Invert Phase to Produce Frequency Split
Step 6: Setup Macro Controls
Highlight the main Audio Effect Rack. Click the Map Mode button. Map the two Macros you just created on the Mids chain to their respective macro on the main group. Then map the frequency of the Low chain to Macro 1 and the frequency from the High chain to Macro 2. Now you have to set the values for each macro.
While still in Map Mode, look to the browser portion of the screen at the top left. You should see something that resembles the picture above. Choose a range of values for each macro that does not overlap, and provides enough flexibility for your planned frequency split. These values can be tweaked later as well. The settings above allow you to isolate lows below 300 Hz and highs from 500Hz to 2500Hz. Again, choose settings that you think are best.
Congratulations, you are now the proud owner of your very own frequency splitting rack in Ableton Live. Now you will have some very flexible processing options for sound design and the like. Enjoy.
If you are having any problems with this rack download my version of it HERE and pick it apart or leave me a question in the comments section.
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