Originally Posted by Edoardo
I want something to decrease/mute the attack level/volume/speed
So you say I'd need to check the impedances... I was more concerned about having to amplify/boost the gain somehow.
essentially there's several different kinds of ins/outs, and impedance is probably the #1 consideration. without going into balanced/unbalanced, consumer -10db vs pro +4db, you basically have
- Microphone - inputs which are typically expecting 600ohm load and a VERY low voltage. These are almost always preamplified with tons of gain available. A guitar into a mic input will sound weak and lacking high frequency definition.
- Guitar/Bass - again low voltage, but MUCH higher impedance, and not exactly compatible with the others due to the impedance difference. Typically preamped and again lots of gain to work with since like a mic you need to boost the tiny voltage to a usable level. Guitars are often in the 50,000 ohm range and should always be plugged into high impedance inputs.
- Line Level - higher voltage, usually more than a volt to make a useful signal, and low impedance. Usually attenuation knob instead of gain, but sometimes both. Typically used as an interconnect between two devices, like a signal processor and a mixer, or mixer and recording interface. A mic or guitar in a line input will give you no usable signal, very quiet. Note that a guitar/bass with a preamp installed inside the guitar (active pickups) can often be plugged directly into a line level input, and in fact, that's one of the great things about an active bass is that you can go right into the mixer's inputs direct.
- Speaker - (relatively speaking) VERY high voltage, VERY low impedence, anywhere from several volts, to several dozen, and often only 8 ohms. NOT compatible with anything but speakers!! Don't ever send the spearker/cab outs from your amp into ANYTHING but a speaker cab!!!
It's a shame there are so many different kinds of ins and outs, and little to no standardization between jack/plug types. It's too easy to blow something up if you don't pay attention to what you're doing.