Global Mute Mode

I want to make a button with different function in global mute mode, for example if it is in global mode then the function is unmute and restart all track but if there is a track playing so the function just play the rest muted tracks

something like this

Code:

---

if inglobalmute
message play and restart all
for all
muteoff
Move Loopframes 0
next
endif

else if !inglobalmute
message play the rest muted tracks
for all
muteoff
next
endif

---

I just change inmute to inglobalmute
Maybe something called variable can help me but I don't know how to use it