Default animations, jumps and sounds

Hi. I created default animation, a2a_soc_chat_happy_loop2_seated and have some problems with it :(

1. When a sim starts to talk (and uses my default animation), he drops down if he sits on a stool (or he jumps up a little, if he sits on a sofa).

2. My animation has no sound. I saw this sounds list, but how do I know which sound do I need exactly?

Also, I read this post by SACRIFICIAL, but don't understand #6: "set the time code on when the sound should start playing, FE: 0.5 ; 1 ; 1.2 etc...." How can I determine these numbers?

Here is my package file.

I will be grateful for any help and advices.