Greetings @bvijay,
From what I can understand, Version 1.2.1.0 includes the fixes implemented in Version 1.1.36.0.
The thing is, since there are now two versions of FxSound—the original and the version with @Theremino improvements—it can be a bit confusing.
Yes, the beta version 1.2.1.0 includes the fixes done in 1.1.36.0.
I understand your concern. Version 1.1.36.0 has gone through some testing and I have made it as latest. After some testing I will make 1.2.1.0 as the latest. I goal is to bring in the improvements done by @Theremino soon.