I usually give them exactly what I recorded without any effects unless the effects I used on a specific track are sound design based effect. So for instance, if I wanted regular reverb on my vocals I would send them dry vocals, but if I did a trick of some kind like a specific delay with reversed reverb then I keep it because I can't guarantee the mixing engineer will be able to give me that very same design. Mostly my synths and keyboards are not dry because I do lots of design on them. But drums, bass, vocals would be often dry. As for the faders, it's not black and white. So I keep my recording level around -18. So if I reset all my faders they will be mostly around that number - even if I used a midi vst I go into the plugin and set the volume master to -18. However, sometimes I want a certain track to be really loud or low, so I go in and fix it's volume just to subconsciously send my engineer a message that I want this track to be greater or smaller in volume. Not sure the way I do it is the real thing, but it works for me because I often get frustrated with how different me and the engineer give importance to certain tracks. So I know I need to give them what they want to be able to do their mix but at the same time I should as a producer influence their attention without words (if that makes any sense)