When the Louisville Orchestra was in danger of folding this past summer, the orchestra’s board claimed that it simply couldn’t raise enough money to pay its operating costs. Three months later, the ensemble is back on track, and money is rolling in from a group of local developers who have pledged to lead the way in making the orchestra fiscally secure. The Home Builders Association of Louisville has already raised more than $400,000 on a $465,000 pledge, and they say they won’t stop there.