every time i open pd-extended, i have to go into the 'media' menu, and select 'jack', and every time i close pd-extended and open it again, it is reset back to 'alsa'. how do i change it so that it is set to 'jack' by default?

here's a good page to read in such an occasion :
http://en.flossmanuals.net/pure-data/ch011_advanced-configuration/

thanks hope this works.