Treble (command: k r), Bass (command: k s), Speaker (command: d v) – HP LD4235 41.92-inch LED Digital Signage Display User Manual
Page 96: Volume mute (command: k e)

02: Music
03: Cinema
04: Sport
05. Game
Acknowledgement
[y][ ][Set ID][ ][OK/NG][Data][x]
18. Treble (Command: k r)
To adjust the Treble values.
Transmission
[k][r][ ][Set ID][ ][Data][Cr]
Data
00 to 64: Treble 0 to 100
Acknowledgement
[r][ ][Set ID][ ][OK/NG][Data][x]
19. Bass (Command: k s)
To adjust the Bass values.
Transmission
[k][s][ ][Set ID][ ][Data][Cr]
Data
00 to 64: Bass 0 to 100
Acknowledgement
[s][ ][Set ID][ ][OK/NG][Data][x]
20. Speaker (Command: d v)
To select the speaker on/off.
Transmission
[d][v][ ][Set ID][ ][Data][Cr]
Data
00: Off
01: On
Acknowledgement
[v][ ][Set ID][ ][OK/NG][Data][x]
21. Volume Mute (Command: k e)
To control the Volume Mute on/off.
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Chapter 12 Controlling multiple products
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