Rules commentary [sblock]I don't know that this would be effective as a readied action. Presumably, the standard action it would take to cast a spell take the same amount of time as the standard action to manifest a psionic power. Thus if Nodis were to wait until Tharok started his spell to manifest his power, then Tharok's spell would complete before Nodis' power manifested. Like, you couldn't ready an action to shoot another spellcaster w/a magic missile spell in order to interupt his magic missile spell. Or could you? It seems the control sound spell only works on 'existing' sounds.
Given that 'silence' has a saving throw if directed at a person, that concentration checks or caster level can counteract damage or counterspells, giving control sound the power to cancel any spell seems a bit too much.
what do you think?[/sblock]