"Ask any electronic man. He wil confirm that using faders will go wrong if you put them to low or to high. Has to do with how there technically build and implemented. Specifications. So it is to be recommended to use them between (estimated, not looked up) 1 and 9 to use them in full. "
Well, I am a specific electronics man 42, will I do?
The 'simple' attenuator is in fact anything but, but unless the equipment designer was very dense (or had a VERY low budget) they work fine at any setting.
The complications arise when we don't know the source and load resistances/impedances. Worse case OPR for a pot is at 6dB when the wiper is at ELCTRICAL half way. If we assume drive Z is zero then R out is 1/4 track resistance, 2.5k for a 10k pot. You would not want to put a LOT of screened cable on such an output if you want to preserve a response just 0.5dB down at 20kHz. However, such a pot INSIDE equipment will have little to no HF loss.
But! CAN we assume a very low drive R? With modern gear, pretty much. Most things have a source R around 100 Ohms but some guitar amp line outs and some pedals can be 1k or more.
With the pot at max the only problem is with the headroom of the following stage. It is possible however by VERY bad design that such a stage will have a low enough resistance that it adversely loads the drive stage..Not likely.
The exception to these rules is the guitar amplifier (as is often the case!) The pots tend to be very high value, 500k-1 meg and capacitances, internal cables, triode grids, proportionately high so backing of a pot can make things get 'dimmer'. This is where the 'speed up' capacitor comes in.
Dave.