Polycom EFIR10 Instruction Manual page 11

If you want to lower the gain on multiple outputs, just add another command to
Macro 53. In this example, let's lower Output B also by 2 dB each time the
Volume Down button is pushed. Right click your mouse in the row for Macro 53
and select I C , O , B, G , -, 2 B:
NSERT OMMAND UTPUT AIN D
You should see this when you are finished:
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