Kui Dong is a composer who is just now getting the wider notice she deserves. The upcoming Volti concert includes her Painted Lights alongside works by David Lang, Tamar Diesendruck, and Ted Hearne. As usual, a Volti choral concert is not for the faint-eared. But Volti sings with such absolute assurance that it make a lot of technical hurdles disappear, and the diversity of its programs usually guarantees that one or two numbers will float your boat.