how to pause sound?

[Electric2Shock]

like you can slow down the voice in lf2.a by using F11 and F12 keys.

You cannot slow down voice, you can lower the volume XD.
What I do is just to make it like LF2_v2.0a by using 2 frames one with spare cuz sounds dont work in first frames in type: 5 for me. So In the first frame I use wait:0 and in the second frame I used the length of the music x 30. Then after the music ends the frame goes to the first frame again.