Mad_Cyril it’s probably more a thing with vinyl as volumes were all over the place with different pressings, but i’m sure the idea still applies.
basically, track 1 is playing at whatever volume at it’s peak, we’ll call it 8/10. when track 2 is at it’s peak, it also needs to be at an 8, but the file is mastered quieter and it’s a 6 when the faders and gain knobs are at the same positions. you need to gain match track 2 to track 1 before bringing it in by increasing the gain knob. that way when the fader is at the top, the tracks are volume matched.
if you’re leaving the faders up and using the gains to bring the new track in, you have to have really well trained ears to make sure the volume stays level from one mix to the next. otherwise you’ll get volume swings that become really noticeable, especially on a recorded mix.
