Αυτό το πρόσεξες?
"When should I use a preamp out?
The preamp out is an alternative you should use when you want your instrument’s signal to take a path different than the one presented by your amp. As we said above.
The most common use of this out is to go straight to a mixer, and then to the house speakers, or maybe from the mixer into a computer to be recorded.
In many cases, the output of the preamp out might be higher than line level, so it’s recommended to get through a mixer first to attenuate it before hitting the sound card of a pc.
Many modern sound interfaces have built-in preamps that can take instrument-level signals and send an appropriate line signal to the PC.
The drawback of going straight into a mixer
A problem that you might face when you go straight from the preamp to a mixer is that you might sound like crap.This is because, as I said many times by now, the final sound you hear when playing through your amp is the result of the preamp + the power section. Well, actually your cabinet and speakers affect the sound also.
This is getting complicated, isn’t it?
You’ll be lacking that power section, cabinet, and speaker coloring in this case.
There are many ways to overcome this problem, and you might have heard about “cab simulation” and “impulse responses”. These are digital solutions that make up for that lack of power section and analog output."