Power Macintosh 7200: Simultaneous Sound Output (1/96)

I have a Power Macintosh 7200 series computer which is connected to a monitor with built-in speakers. I would like to play audio through the computer's internal speakers while playing audio through my monitor's speakers. I think I have everything set up properly in the Sound control panel, but each time I restart the computer, sound is no longer played through the computer's internal speaker. I only get sound out of the monitor's speakers. What is the proper way to set this up so that the settings will remain?
To have sound output through both the internal speakers of the Power Macintosh 7200 and the monitor's speakers, follow these steps:

Step 1
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Connect an audio cable from the sound output port on the computer to the sound input port on the monitor.

Step 2
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Select Volumes from the popup menu in the Sound control panel.

Step 3
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Deselect (uncheck) both the "Builtin" and "Builtin Headphones" Mute checkboxes.

Step 4
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Follow steps 23 each time you restart the computer.

When speakers or headphones are plugged into the sound output port on a Power Macintosh 7200 series computer, the computer mutes the builtin speaker by default during startup. This is normal for the Sound control panel to behave in this manner, and the only workaround is to change the settings after restarting the computer.

This article was published in the "Information Alley":
Volume II, Issue 19, Page 13

Article Change History:
30 Jan 1996 - Added Info Alley info.
05 Jan 1996 - Corrected minor typo.

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Published Date: Feb 19, 2012