questionsis there a usb device to play a sound on a mac?

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You can hack the Staples Easy button to do whatever you want. It's not easy but here's a video on how to do it:

http://blog.makezine.com/2011/04/08/the-awesome-button/

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You could wire 110V to your chair with a remote pushbutton. But I don't think OSHA or the Geneva Convention would approve.

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There is an iPhone app called REMOTE that will allow someone to pause or turn down the volume on your iTunes with their iPhone. An easier option is to have the person send a text message "TURN IT DOWN" to your email address and just have your email set with an alert sound for new messages.

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I'm not understanding your intent here.