How to control sound which is on the timeline

I have sound on the timeline.

Also I have the following buttontns:

pause_btn, play_btn, sound_on_btn, sound_off_btn

I'd like when the user click:

pause_btn: The sound pause.

play_btn: The sound continues playing.

sound_on_btn: The sound is off but it continues playing..

sound_off_btn: The sound is on.

Please help me.