no9 Footsteps Package just landed in Unreal Marketplace. If you are Unreal Engine user then it might be worth checking. It is quite big and as name just states it contains various walking sounds:
Attempt to make simple music system with horizontal and vertical interactive arrangement which follows user progress and going back to areas passed before. It respects tempo and given number of bars of the music. But it is also limited and not very effective for more complex music tracks and presents some flaws in UDK audio engine which suggest to use middlewares like FMOD or WWise to achieve good results much quicker. Any later changes to the music makes implementing it in UDK quite a pain.
Listen how it works here.
and have a quick glance on some Kismet Wires:
ps: video was recorded with some free software I had around and it causes significant framedrop. It did not record any sound so I had to do separately (by connecting headphone output to input by cable :>) and put it together later. Forgive me such a quality.