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I have an iMac running OS X El Capitan version 10.11.6. I have two Roland external speakers (older - maybe 2006) running from the headphone port/jack, and with many different apps the volume starts to increase on its own. The audio preferences are set to "headphone port" and the external speakers do not have any sort of automatic volume control - just simple volume knobs that must be turned manually. It is very annoying as I constantly have to keep turning the volume back down again.

Any suggestions?

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