Hi, accidentally picked up guitar and bass in mono, are is an empty track and the other with the audio. As a step mono stereo? Or else, as I duplicate the mono track, I have to channel out the same sound? Thank you so much.
The guitar and bass guitar ARE monophonic instruments. Generally, the way to make them stereophonic is to add some sort of stereo effect(s) (stereo reverb, stereo delay, stereo chorus, stereo tremolo, etc...).
The Stereo Processor has absolutely no effect on mono tracks. It only works on objects (or the entire arrangement) that already contains stereo properties.
Having two identical mono tracks, even panned hard left/right, results in a mono sound. For there to be any stereophonic effect, there has to be some significant time, frequency or timbre based difference between the two mono tracks. Making a volume difference between the two mono tracks will simply shift the "apparent mono image" towards the louder side.
He has a stereo track with audio in one channel and no audio in the other channel. After doing what johnebaker suggests, he will have a centeredmono track which can then be panned to any location within a stereo soundstage.
At this point, my prior comments will become relevant. Sorry for the confusion.
You can buy effects processors that can simulate stereo for mono tracks, but the ones that actually do a good job are very expensive (thousands of dollars) and are mostly used by recording studios. Some electric guitars and bass guitars have a stereo output but that means putting them through two amplifiers, and either using a michrophone on each one or taking a line out from each to your mixer/recording device. If you are recording with a microphone, either use two and set them about center stage angled left and right, or use a stereo microphone and record both signals on different tracks. You can also simulate a stereo sound by using eq, delay, flanger, chorus or any number of effects on the left and right channel, but it will never be true stereo. True stereo really needs to be recorded at the source.