Macintosh 5200 with 8-bit Sound: Clicks in Sound Control Panel

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TECHINFO-0020393

TOPIC

I have a Macintosh Performa 5200 computer that included System 7.5.1. After updating to System Software 7.5.3 using System 7.5 Update 2.0, I hear clicking sounds before the Alert sound is played in the Sound control panel. This seems to occur only in the Sound control panel. What is causing these clicking sounds?

DISCUSSION

These clicking sounds appear to be related to the interaction between the version of Sound Manager that is installed with System 7.5 Update 2.0 and the sound chip in some Power Macintosh and Macintosh Performa 5200 series computers. The computers that may be affected have 8-bit, 22.254 sound output. To determine whether your computer has 8-bit sound follow these

Steps:

Step 1: Choose Control Panels from your Apple menu.
Step 2: Open the Sound control panel.
Step 3: Choose "Sound Out" from the "Alert Sounds" pull down menu. If the 16-bit sound input radio button is grayed out, you have 8-bit sound.
Step 4: Use the close box in the upper left corner to close the Sound control panel.

System 7.5.1, which was included on your computer, has Sound Manager version 3.0.2 built into it. After updating with System 7.5 Update 2.0, Sound Manager 3.2 is installed. The clicking sound occurs only on Power Macintosh and Performa 5200 series computers which have 8-bit sound and which have Sound Manager 3.2 installed.

To resolve this issue, you should install QuickTime 2.5, which installs Sound Manager 3.2.1. After upgrading the Sound Manager to 3.2.1, the clicking sound no longer occurs in the Sound control panel. QuickTime 2.5 is available on the online services. These articles can help you locate the software update mentioned here:

"Where To Find Apple Software Updates" - Lists online services for free Apple software updates.
"Obtaining Apple Product Support in the USA" - Lists 800 numbers and online services for software updates, Apple support information, and a subset of the Apple Tech Info Library.

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