I tried a standing desk for a while and I loved it, however I had a fairly major problem that I couldn't find a way around: I need to sit sometimes.

I was unable to find a stool that would allow me to continue using the standing desk since I am 6'6". That means that in order to continue using the desk on a stool, I need a stool that is ~6" taller than the best I could find.

Due to the fact that I do a heavy amount of audio work, I require some equipment in front of my keyboard/mouse and the height and position of the sets of speakers that I use is fairly important.

Does anyone have any ideas to deal with this?

edit: I love the solutions being suggested, but I don't have that much money to spend on it unfortunately.