The cycles I had this game for was around 10000, if its running choppy just put them up higher till the game seems to play fine.
This is what my Dosbox looks like when I start up.
To get that I put the Right side on Brief.
And the Left side I turned off. It's best to have NC just show what is in your Old Dos Games folder, then just double click on the game folder you want, it will show you whats in that folder then double click the .exe you want to run. I don't know alot about setting up Dosbox myself, I learnt what I know from that tutorial.
On the note of changing the keybinding, press Ctrl-F1 to bring it up. For whatever key you want to change click on it. Then Delete the old binding and add a new one. Can be very helpfull when a game has bad controls you want to change but it doesn't give you that option.
For the music problem, have a look in the games install.exe or setup.exe and turn the music soundcard off.