It sounds like the best solution for everyone's nerves, including yours, is to train your little ones not to bark so much. I haven't tried the ultrasonic device, but I have had a lot of success with pennies in a can. It's low-tech, but it might work for you.
Also, dogs tend to bark when they are very excited. Are they getting enough exercise? It sounds like maybe there is a cycle going on where you don't take them out because they bark, so they get even more antsy and rambunctious when they ARE let outside, which means you keep them inside even more.... Maybe they just need to be habituated to be out and about?