for parallel sound, thats the easiest, almost all the in between position(combo of 2 pickups) among most of the more common geetars sold in public are all in parallel. From les paul to strat to tele and more.
As long the pickup selector switch is switched to combo of 2 pickup, we are hearing parallel sound.
For series, again it involved 2 pickups(or just one, if its humbucker). The sound is fatter, thicker than 2 pickups in parallel and louder.
For out of phase, it will still involve 2 pickups(one pickup cannot be out of phase with itself. 1 humbucker can be out of phase with it self if wired to be, coz its 2 single coil in 1, but no point wiring a humbucker out of phase with itself, coz the signal strength will be greatly reduced due to phase cancellation), wired in opposite direction. so the maijk(easy way of putting it) will be a drop in volume and bass. The sound will be thin and nasal
heh, just imagine fat, medium build and skinny for series, parallel and out of phase sound