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Trying to find a way to automatically "chop" or limit frequencies above 9.6 KHz. Right now we can manually select what we want and delete it, but it would be nice to have that automated.
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Automation is generally a bad thing, especially in audio processing, as all audio is different. That's why you will find very little of it in Audition - it's generally something you'll find only in consumer products.
But in this instance, it sounds as though you are trying to use an inappropriate tool. If you want to limit frequencies above a defined point, then using the multiband compressor is a much better bet, as it will do all the work for you:
Set the frequency appropriately, and adjust the threshold slider until you get the degree of reduction you want (red compression indicator). It's set pretty low in this example, as there's very little content at that frequency to limit, and to show you the indicator at all, I had to set the limiter to zero. The other thing you might want to do is set the ratio to be somewhat higher, depending upon how rapidly you want levels above that frequency to attenuate. 10:1 is more like it for hard limiting - there isn't generally much point in going beyond this, and although the control goes up to 30:1, you'll be hard put to discern any difference.
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Or alternatively just use a filter to get rid of it. Try the Low Pass filter in the Parametric EQ to roll off all the high frequency signal above 9.6kHz. there is a generic Low Pass preset you can use and just reduce the frequency a bit. What is there above 9.6kHz that is causing problems within your audio?