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If the TU3 is before the Crybaby it becomes shrill and orrible!
I have removed the buffer from the Crybaby BTW
Sorry Gassage, but your hosepipe analogy is a good example of how it's possible to frame an argument that sounds reasonable on the face of it but doesn't really make any sense.
But I agree with you on Brexit, so it's not all bad.
I once made a 100 foot lead, used it directly between guitar and amp and it was very dull sounding as you'd expect from the high capacitance of such a cable. Then I tried guitar-> 3ft cable-> buffered tuner-> 100 ft cable -> amp and it was essentially indistinguishable from just plugging the 3ft cable into the amp. There may have been slight low end differences based on the sound of the buffer circuit I guess, but the test was good enough to convince me that once you've got a buffered signal, the following cables don't really matter much - though RELIABILITY is a factor, and the reason I'll never use those shit pancake jacks.
The only exception would be something like the Fulltone OCD where the output from that pedal is greatly affected by the load it's seeing; If I had an OCD on my board still (I didn't like it that much IIRC) I'd definitely put another buffer, preferably with a variable input impedence, directly after the OCD.
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A guitar pickup is quite weak, so it's easily bogged down if it has to push its signal through a lot of cable. This causes high frequency roll off - the longer or the worse the cable is, the lower the frequency where signal starts being reduced in volume.
A buffer is like a big repeater station. It takes the weak signal and fortifies it with vitamins and minerals so that it can power through a lot of cable without losing high frequencies.
If that buffered signal then goes into another buffer, say a buffered pedal like a Boss, the signal that comes out of that second buffer will only be as strong/ good as the second buffer is. The vast majority of buffers are fine, and the only negative they have is that often they are *slightly* quieter than the input, so if you have ten buffers in a row your signal is the same bit slightly quieter.
If a pedal is true bypass, then the signal doesn't see the pedal's circuit. It just goes through the input jack socket, the footswitch, then the output jack socket. If there's a buffer then 10 true bypass pedals in bypass mode, the output of your buffer can "see" the input of the amp and vice versa. If you then turn one of the true bypass pedals on, the buffer can only see the input of that pedal, and the amp's input can only see the output of that pedal.
In the case of a pedal like the OCD, that means that you can have a buffer giving you a strong signal to the amp, then you stamp on the true bypass OCD and suddenly you're relying on the OCD's weak output to drive the signal down the rest of the cables etc to your amp - and the OCD gets loaded down, giving you a nice thick tone with lots of treble roll off. Then you stamp on another true bypass pedal, say a delay, after the OCD in your signal chain, and the OCD's output only has to drive a 6 inch cable to the input of the next effect, then the delay's output drives the signal to the amp. Suddenly your tone gets a lot brighter and fizzier because the OCD's output isn't being loaded down as much.
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Nil Satis Nisi Optimum
You'll forgive everyone's complete lack of surprise.
https://soundcertified.com/speaker-ohms-calculator/
But it could be a hashtag thing.
#i'msurprisedtohearyouthinkit'soktohatemarmite
https://soundcertified.com/speaker-ohms-calculator/
However, a simple level boost *can* fix the 'tone suck' of lesser buffers, when they're just lesser because of level loss. But at that point it's a booster not a buffer.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
That said, a buffer with low input or high output impedance isn't really a buffer. And in both of those instances you'd be better off chucking the crap buffer rather than adding an extra one.