Thanks for both replies. I'll do the hack and see what it does. I use Senn PXC250's as I haven't found an earbud I like or can keep in my ears. I have also used Ety Er4's and Shure e3c's but the ety's are no good (IMHO) because they are not built to withstand anything like normal use (despite sounding good and isolating beautifully), and to my ears the Shure's don't sound that great, and yes, I am getting a good seal. I am unimpressed with the top end and the rather "goinky" sounding bass that doesn't seem to go really low at all. The Senn's don't quite isolate enough for quiet passages in music in a noisy environment so I was hoping for just a "little" more volume for these quiet pieces. I also have some Sony EX70's and despite modding them I can't really listen to them that much as they sound so artificial even by comparison with the colo(u)red sounding Senns. Not quite sure where to go from here.