Controlling a power strip with a toggle switch. Flight sim design
If the switches in the power strips are double-pole you can use one pole to switch the power and the other pole to switch the digital signal that goes into whatever electronics you're using. Check this table if you're unsure what double-pole means.

Do you need the switch on power strip 2 to still play a sound even if power switch 1 is off? If you don't you can just have your electronics detect the 120 VAC in the power strip. A cheap and easy way to do this is just plug a DC power adapter into the power strip. If you use a 5V USB one ($1 on eBay) you can probably plug it straight into the inputs of the electronics. When you turn on the strip it will get power and output 5V.