Why both of Audio and Animation of Sequencer dont have Key Frames

[Graphemer]

http://www.unrealchina.com/data/attachment/forum/201702/22/130048uwu8bv3888cuwcqe.png

http://www.unrealchina.com/data/attachment/forum/201702/22/130048ojjnob71kv7vok7n.png

http://www.unrealchina.com/data/attachment/forum/201702/22/130301wvrjrqgjgevleyjg.png

http://www.unrealchina.com/data/attachment/forum/201702/22/130302mi2mgqpfy3rmsjji.png

As shown in figure，Why the official document have the extra list but I havent
thx so much