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VP-81K - Table of Hex Codes for Serial Communication (Protocol 2000) 27
The following table lists the hex codes that set the audio output gain. Before
sending the any of these codes, the command 2A 87 80 81 must be sent.
OUT 1 Level [Rel]
16 81 80* 81 -36dB
…
16 81 C8
*
81
0dB
…
16 81 D4
*
81
+6dB
*BYTE 3 = 0x80 + Gain Value (0x00-0x54)