
0000 is all four bits 4,5,6,7 all set to zero (bits 0123 don't matter)
1111 is all four bits 4,5,6,7 all set to one
Using binary you can count from 0 to 15.
For example, to set 3 dB you would set bit 6 and 7 to one:
0011
An example of 5 dB would be 0101 (bits 5 and 7 to one)
An example of 6 dB would be 0110 (bits 5 and 6 to one)
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