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although this forum is not the most rightful to help you out...

I assume you're using qjackctl to run JACK over your M-Audio Audiophile 2496, a PCI soundcard, right?
re. volume is way low
you can try first using alsamixer to tweak the volumes of the several device channels according to taste and sanity :)
re. can not hear sound from browser- like watching YouTube.
of course you can't: your browser doesn't talk to jack and jack takes exclusive control of the audio/pcm device; what you need is most probably interface jack with pulseaudio and that my friend is whole lot of a new subject, but i'll give you the hints for you to read during the holidays :)

nb. the last one--or a variation of it--is the one I do use at home.
hth.
cheers