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Hi Rui,
yes, it's quite difficult for me to explain, and I choose the hard way to explain it :-)

The actual situation is the following:
- a laptop + external sound card
- the sound card's inputs are connected to 4 mics
- sound card's outputs 1 and 2 are connected to the main speakers
- sound card's outputs 3 and 4 are connected to my earphones
- the laptop is running a single istance of Qtrator and some virtual instruments.

Qtractor should take the incoming audio from mics and virtual instruments, and make 2 mix: one for the main speakers, and the other for the earphones.

Live situation #1: Handling an external metronome(not the one provided by Qtractor) - I want to hear it from the earphones, but not from the main speaker.
Live situation #2: I may want to hear a microphone in my earphones at higher volume than in the main speaker, while all other channels volumes remain the same.
Live situation #3: I may want to do a manual fade-out/fade-in of a channel, without loosing that channel's output level setup for 1+2 and 3+4.

I've tried to resolve the #3, i.e. for my sampler, in this way:
- I created the MAIN OUT BUS, connected to sound card's outputs 1+2
- I created the EARPHONES BUS, connected to sound card's outputs 3+4
- I created a BUS named "sampler"
- I connected the outputs of my virtual sampler with the inputs of "sampler" BUS
- I created two AUX SENDS in the POST fader of the "sampler" BUS: the first AUX sends audio to the MAIN OUT BUS, while the second sends audio to the EARPHONES BUS

Having done this, I can adjust the two AUX SEND's volumes in the way I want (i.e. -2db for the MAIN OUT, and +1db for the EARPHONES), using the "sampler" BUS volume's fader to do the fade-in/fade-out stuffs.