if (ac) {
double v = ac->internal_to_interface (ac->get_value());
v = std::max (0.0, std::min (1.0, v + steps * (neg ? -.01 : .01)));
if (ac) {
double v = ac->internal_to_interface (ac->get_value());
v = std::max (0.0, std::min (1.0, v + steps * (neg ? -.01 : .01)));