I remember composing in TakeTracker through DosBox and remember it working perfectly fine. May be your CPU that lack a bit of firepower or you forgot the Ctrl+F12 combo for over-clocking DosBox.
I have not yet tested running TakeTracker on my new box with Windows 98SE which I got some month ago or something, but I'll get to it and see if there's any clear difference between running it in DOS and running it in DosBox.
By the way, did you install the latest version of DosBox? Version 0.72 is out.