Pretty much every Pup I run uses pizzasgood's marvellous Retrovol.....and this app hinges on use of the hidden .retrovolrc config file. What I do when setting any new Puppy up is to set things as I want them for conventional speakers, then make a copy of .retrovolrc. I then plug the headphones in - and this next step works for both pairs of USB headphones, since both display the exact same set of controls - I set the headphones as default, then make a copy of this .retrovolrc file as well.