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I have a RadioShack analog SPL meter that had been working fine, now all of a sudden it is acting goofy. It seems to work OK without the output connected to the computer, but once that is connected it maxes out the meter and it is not giving a signal to REW. All of this occurred since the last time I used it successfully and it had been just sitting there with no change of connections.

Any ideas?
 

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You are connecting it to a soundcard input that is expecting a mic and is putting out a voltage to supply the mic, which backfeeds the SPL meter gauge. Your soundcard may have a mic/line connection for the input that needs to be set for line, or you may be connecting to a mic input when previously you used the line input.
 
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