code to randomise whether to mute or unmute song playing.

Hi there,

I've been trying to work out how to do what the title says.

Basically, I have 4 instruments playing at the same time that make a song when played together, each instrument is played through a different song, so I can control each instrument individually. I want it so, when the user clicks there mouse, the instruments randomly mute or stay playing, or if they are already not playing, they either keep not playing, or become unmuted.

Any help would be greatly appreciated.

Thanks.