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X2 TRS Instrument Output Questions

Here's what the user manual says:

"Instrument Output Jack
This 1/4” unbalanced TRS output jack (1.8 kΩ) is voiced at the tip for instrument applications (gentle high-frequency role off at 8 kHz approximates sound of a 15’ cable), and full bandwidth (10 Hz to 20 kHz) on the ring. Great for ‘tuner’ out or dual amp setups."

My understanding of this is that if I plug a TRS cable into the jack, I will get a full bandwidth signal on the ring and a filtered signal on the tip. What I don't understand is how/when I would use these signals.

First, the how questions:

Is it correct to assume that my amp input only uses the tip for the input signal? If so, how do I get the ring signal from the X2 into the amp? Are there cables that make this connection? If I wanted to access both the tip and the ring signals at the same time, is there a box that gives me two outputs with the signals on the tip of each?

Now for the why:
Under what circumstances would I want the full bandwidth vs. filtered output? I see what the user manual says about tuner output. Is it really necessary to use the full bandwidth signal for a tuner? Are there situations where I would want to use the full signal for the amp input?

EDIT:
I found this:
http://accessories.musiciansfriend.com/product/Live-Wire-TRSMDual-14-Insert-Cable?sku=330898
It looks like this is the cable that would give me access to both signals. Am I correct?