>>2627358seeing as how it uses DLL files and what libraries it uses, i'm betting on C++. maybe C# I guess but it wouldn't make much sense to use the .NET framework.
Code was supposed to be open source in the next update but seeing as how the site hasn't seen any activity in two years it's safe to assume it's abandonware now.
You could probably get away with making a script that fetches the threads using the 4chan API :
https://github.com/4chan/4chan-APIAs for the program, I think you'd want to first define the speed of the delays between beats (something like Fast = 1s for example) and play a soundfile for as many times as the post says.
The idea is to make something simple so it works consistently, instead of using complex stuff like DirectX.