Pendulum scale placement is irrelevant (as of the moment). You can have a scale 1 in the left scale and a scale 9 in the right scale; either way, you can summon monsters of the levels 2-8 from your hand (or Extra Deck, if a face-up Pendulum Monster exists there).
If I control a Dragoons of Draconia and Sea Dragoons of Draconia (scales 2 and 7 respectively), I can summon any monsters of the levels 3, 4, 5, and 6.
So, if my hand contains Tune Warrior, Blazing Inpachi, Bunnilla, Giga Gagagigo, and Red-Eyes Black Dragon, then I can only summon the following:
The level 3 Tune Warrior
The level 4 Blazing Inpachi
The level 5 Giga Gagagigo.