Sound-Proof Bubble
(Alteration)

Range:  5 feet per level
Components:  V, S, M
Duration:  2 rounds per level
Casting Time:  4
Area of Effect:  10-foot radius sphere
Saving Throw:  Negates

If the caster casts this spell, he brings about an invisible bubble with rad of 10 feet centred at the target he selects. Depending on the caster's choice, the spell can work in one of 2 Ways:
•	No sound can enter the bubble, and no sound can leave the bubble, but sound inside the bubble, and outside the bubble, stays normal. I.e., the caster and a few companions can have a nice and quiet conversation inside this bubble while a deafening noise is raging (whatever) outside.
•	He may opt to allow sound to pass in or out through the bubble, or both or none. He can change the function of the bubble anytime before the duration ends, but this version of the spell requires the caster to concentrate the whole time he want to maintain the bubble. The bubble's function can be changed once per round. Also this version of the spell have to be centred on the caster.
This spell will proof safety to sound based attacks, but each such attack has a cumulative 15% chance of bursting the bubble. I.e., the first attack has a 15% chance, the second has a 30 percent chance, etc. Note that the attacker can walk into the bubble, and then attack those inside the bubble, and anyone outside won't hear the sound or attack.
Wizards and priests can cast spells with verbal components inside the bubble, but if the spell uses a sound based effect, those sounds will not be able to pass through the bubble. If the sound originates from an illusion outside the bubble, one won't be able to hear it inside the bubble. How the ventriloquism spell is to be handled, when cast inside the bubble, is left up to the DM. Ask him beforehand how he will handle it.
If you want to cast the spell on an unwilling recipient (for example, someone with a horn of disruption), he is allowed a saving throw versus spell to negate the spell.
The material component of this spell is a tiny triangle.

