PureTools PT-PMS-82S User manual

User Manual
PT-PMS-82S
User Manual
8x2 HDMI 2.0 Seamless Matrix Switcher
Model PT-PMS-82S
Designed in Germany
© 2018 PureLink GmbH All rights reserved. V1.0

User Manual
PT-PMS-82S
Preface
Read this user manual carefully before using this product. Pictures shown in this
manual are for reference only. Different model layouts and specifications are subject
to the physical product.
This manual is for operation instructions only, not for any maintenance usage.
In the constant effort to improve our product, we reserve the right to make changes in
functions or parameters without prior notice or obligation.
Trademarks
Product model and logo are trademarks. Any other trademarks mentioned in this
manual are acknowledged as the properties of the trademark owner. No part of this
publication may be copied or reproduced without the prior written consent.
FCC Statement
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful
interference to radio communications. It has been tested and found to comply with
the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference in
a commercial installation.
Operation of this equipment in a residential area is likely to cause interference, in
which case the user at their own expense will be required to take whatever measures
may be necessary to correct the interference.
Any changes or modifications not expressly approved by the manufacture would void
the user’s authority to operate the equipment.

User Manual
PT-PMS-82S
REACH | 1907/2006/EU
ROHS | 2011/65/EU
PureLink hereby declares that this product PureTools PT-PMS-82S complies with
Directives 1907/2006/EU und 2011/65/EU.
EMC / LVD (Electro Magnetic Compatibility / Low Voltage Directive)
PureLink GmbH hereby declares that this product PureTools PT-PMS-82S complies
with Directives 2014/30/EU and 2014/35/EU. The full text of the EU Declaration of
Conformity is available at the following Internet address:
http://www.purelink.de/ce/4251364718230_CE.pdf

User Manual
PT-PMS-82S
SAFETY PRECAUTIONS
To ensure the best from the product, please read all instructions carefully before
using the device. Save this manual for further reference.
Unpack the equipment carefully and save the original box and packing material
for possible future shipment
Follow basic safety precautions to reduce the risk of fire, electrical shock and
injury to persons.
Do not dismantle the housing or modify the module. It may result in electrical
shock or burn.
Using supplies or parts not meeting the products’ specifications may cause
damage, deterioration or malfunction.
Refer all servicing to qualified service personnel.
To prevent fire or shock hazard, do not expose the unit to rain, moisture or install
this product near water.
Do not put any heavy items on the extension cable in case of extrusion.
Do not remove the housing of the device as opening or removing housing may
expose you to dangerous voltage or other hazards.
Install the device in a place with fine ventilation to avoid damage caused by
overheat.
Keep the module away from liquids.
Spillage into the housing may result in fire, electrical shock, or equipment damage.
If an object or liquid falls or spills on to the housing, unplug the module
immediately.
Do not twist or pull by force ends of the optical cable. It can cause malfunction.
Do not use liquid or aerosol cleaners to clean this unit. Always unplug the power
to the device before cleaning.
Unplug the power cord when left unused for a long period of time.
Information on disposal for scrapped devices: do not burn or mix with general
household waste, please treat them as normal electrical wastes.

User Manual
PT-PMS-82S
Table of Content
1. Product Introduction ..................................................................................................................1
1.1 Features ..............................................................................................................................1
1.2 Package List .......................................................................................................................2
2. Specification.................................................................................................................................3
2.1 PT-PMS-82S Matrix Switcher .........................................................................................3
2.2 PT-HDBT-200 Extender Kit.............................................................................................5
3. Panel Description........................................................................................................................7
3.1 Matrix Switcher Front Panel...........................................................................................7
3.2 Matrix Switcher Rear Panel ............................................................................................8
3.3 Transmitter Front and Rear Panel.............................................................................. 10
3.4 Receiver Front and Rear Panel ................................................................................... 11
4. System Connection.................................................................................................................. 12
4.1 Usage Precaution........................................................................................................... 12
4.2 System Diagram............................................................................................................. 12
5. Button Control........................................................................................................................... 13
5.1 Manual Switching .......................................................................................................... 13
5.2 Automatic Switching..................................................................................................... 13
5.3 Resolution Selection..................................................................................................... 14
5.4 Sound Volume Control................................................................................................. 14
6. IR Remote Control.................................................................................................................... 15
7. GUI Control ................................................................................................................................ 16
7.1 Video Switching............................................................................................................. 17
7.2 Resolution Selection..................................................................................................... 18
7.3 Audio Control ................................................................................................................. 19
7.4 Configuration ................................................................................................................. 20
7.4.1 PoC Setting.......................................................................................................... 20

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7.4.2 EDID Management............................................................................................. 21
7.4.3 Relay Control ...................................................................................................... 22
7.5 CEC Control..................................................................................................................... 23
7.6 Tags Setting .................................................................................................................... 26
7.7 RS232 Control ................................................................................................................ 27
7.8 Network Setting............................................................................................................. 29
7.9 Password Setting........................................................................................................... 30
7.10 GUI Upgrade ................................................................................................................. 31
8. RS232 Control........................................................................................................................... 32
8.1 RS232 Control Software .............................................................................................. 32
8.2 RS232 Communication Command ............................................................................ 34
8.2.1 Device Control.................................................................................................... 34
8.2.2 Source Switching ............................................................................................... 35
8.2.3 Preset Setting ..................................................................................................... 36
8.2.4 Output Resolution Setting............................................................................... 37
8.2.5 Audio Control...................................................................................................... 38
8.2.6 EDID Management............................................................................................. 39
8.2.7 Relay Control ...................................................................................................... 40
8.2.8 VGA Output Image Adjustment ...................................................................... 40
8.2.9 Switcher Baud Rate Setting............................................................................. 41
8.2.10 CEC Control....................................................................................................... 42
8.2.11 Third-party Device Control........................................................................... 45
9. OSD Control............................................................................................................................... 47
10. Panel Drawing......................................................................................................................... 50
11. Troubleshooting and Maintenance ................................................................................... 52
12. After-Sales Service ................................................................................................................ 53

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1
1. Product Introduction
Thanks for choosing the PT-PMS-82S 8x2 multi-format seamless presentation matrix
switcher with one PT-HDBT-200 extender kit! The matrix switcher simplifies
meeting room and presentation space system integration by providing one
HDBaseT input, four HDMI inputs, one VGA input, one DP input, one USB-C input,
one HDBaseT output and one HDMI output. It also provides external audio inputs to
be embedded in HDBaseT, HDMI and VGA video inputs respectively. Moreover, it
provides MIX audio input for global audio.
The matrix switcher provides true 4K scaling up to 4K@60Hz@4:4:4. Both inputs
and outputs are capable of providing 4K@60Hz@4:4:4 signals. The HDBaseT input
and output provide an innovative solution with VLC technology, allowing
transmission of HDMI 2.0 signals over a CATx cable while ensuring very high,
original image quality. It is designed for use with the PT-HDBT-200 extender kit. The
USB-C input is ideal for AV interfacing with newer MacBook, Chromebook, and
Windows PC, as well as smart phones and tablets.
The matrix switcher supports auto switching on HDMI, HDBaseT and HDMI loop
outputs based on TMDS activity signals sensing. It also allows users to control
system functionality via Web GUI, RS232, IR and CEC. Additionally, users can control
relay device such as the rise and fall of projector screen over RELAY ports.
The matrix switcher is designed to be the central component of AV system. It is
ideal for applications where multiple signals with different resolutions must be
optimized for displays. It is also suitable for presentation spaces where two displays
are needed.
1.1 Features
HDMI 2.0 and HDCP 2.2 compliant. The video resolution can up to 4K@60Hz 4:4:4.
Supports video resolution down-scaling and up-scaling, 1080P, 1920x1200P,
4K@30Hz, 4K@60Hz can be selected for HDMI and HDBaseT outputs.
Supports automatic switching.
Features a mirrored HDMI output for HDBaseT output.

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Visually lossless video de-compression and compression for HDMI signals
transmission up to 40m at 4K and 70m at 1080P on HDBaseT input and output.
HDBaseT input and output support 24V PoC.
External balanced audio inputs can be embedded in one HDBaseT input and two
HDMI video inputs respectively.
Provides two groups of audio outputs (balanced audio and digital SPDIF audio) for
audio de-embedding.
Supports MIX audio input and its volume control.
Supports HDMI output, HDBaseT output audio control.
Controllable via RS232 local and pass-through, IR local and pass-through, TCP/IP,
relay, CEC and on OSD.
1.2 Package List
Matrix Switcher
1x PT-PMS-82S 8x2 HDMI 2.0 Seamless Matrix Switcher
2x Mounting Ears with 6 Screws
4x Plastic Cushions
1x IR Remote
1x IR Receiver
3x 3-pin Terminal Blocks
7x 5-pin Terminal Blocks
1x Power Adaptor (24V DC 6A)
Extender Kit
1x PT-HDBT-200-TX HDBaseT Transmitter
1x PT-HDBT-200-RX HDBaseT Receiver
4x Mounting Ears with 8 Screws
8x Plastic Cushions
1x 3-pin Terminal Block
1x User Manual
Note: Please contact your distributor immediately if any damage or defect in the
components is found.

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2. Specification
2.1 PT-PMS-82S Matrix Switcher
Video Input
Video Input
(1) HDBaseT, (4) HDMI, (1) Display Port, (1) VGA, (1) USB-C
Video Input Connector
(1) RJ45, (4) Type-A female HDMI, (1) Type-A female DisplayPort,
(1) 15-pin female VGA, (1) Type-C USB 3.0
Video input Video Resolution
HDBaseT: Up to 4Kx2K@60Hz 4:4:4
HDMI: Up to 4Kx2K@60Hz 4:4:4
DP: Up to 4Kx2K@60Hz 4:4:4
VGA: Up to 1920x1200 (50/60Hz)
USB-C: Up to 4Kx2K@30Hz
Video Output
Video Output
(2) HDMI, (1) HDBaseT
Video Output Connector
(2) Type-A Female HDMI, (1) RJ45
Video output Video
Resolution
HDMI: Up to 4Kx2K@60Hz 4:4:4
HDBaseT: Up to 4Kx2K@60Hz 4:4:4
HDMI Version
2.0
HDCP Version
2.2
Audio Input
Audio Input
(1) External balanced audio (L+R) for 1-HDBT input port
(1) External balanced audio (L+R) for 2-HDMI input port
(1) External balanced audio (L+R) for 3-HDMI input port
(1) Stereo auxiliary audio for 6-VGA input port
(1) Balanced MIX audio
Audio Input Connector
(4) 5-pin terminal blocks (1) 3.5mm jack
Frequency Response
20Hz –20KHz, ±3dB
Max Input Level
2.0Vrms ± 0.5dB. 2V = 16dB headroom above - 10dBV (316mV)
nominal consumer line level signal.
Input Impedance
>10KΩ

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Audio Output
Audio Output
(1) Balanced audio (L+R) for 1-HDMI output audio de-embedding
(1) Digital SPDIF audio (L+R) for 1-HDMI output audio de-embedding
(1) Balanced audio (L+R) for 2-HDBT output audio de-embedding
(1) Digital SPDIF audio (L+R) for 2-HDBT output audio de-embedding
Audio Output Connector
(2) 5-pin terminal blocks (2) Toslink connectors
Frequency Response
20Hz –20KHz, ±3dB
Max Output Level
2.0Vrms ± 0.5dB. 2V = 16dB headroom above -10dBV (316mV)
nominal consumer line level signal
THD+N
< 0.05% (-80dB), 20Hz –20KHz bandwidth, 1KHz sine at 0dBFS level
(or max level)
SNR
> 80dB, 20Hz - 20KHz bandwidth
Crosstalk Isolation
> 70dB, 10KHz sine at 0dBFS level (or max level before clipping)
L-R Level Deviation
< 0.3dB, 1KHz sine at 0dBFS level (or max level before clipping)
Frequency Response
Deviation
< ± 0.5dB 20Hz - 20KHz
Output Load Capability
1KΩ and higher (Supports 10x paralleled 10KΩ loads)
Stereo Channel Separation
>70dB@1KHz
Noise Level
-80dB
Control Part
Control Port
(1) RS232, (2) RELAY 1-2, (1) IR EYE, (2) IR IN, (1) IR OUT, (1) TCP/IP, (1)
FIRMWARE
Control Connector
(3) 3-pin terminal blocks, (4) 3.5mm jacks, (1) RJ45, (1) Type-A USB
General
Transmission Mode
HDBaseT
Transmission Distance
HDBaseT Input/Output:
1080P@60Hz ≤ 230 feet (70 meters),
4K@60Hz ≤ 131 feet (40 meters)
Bandwidth
18Gbps
Operation Temperature
-10℃~ +55℃
Storage Temperature
-25℃~ +70℃
Relative Humility
10%-90%

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General
External Power Supply
Input: AC 100~240V, 50/60Hz; Output: 24V DC 6A
Power Consumption
85W (Max)
Dimension (W*H*D)
436.4mm x 44mm x 356.5mm
Net Weight
2.87KG
2.2 PT-HDBT-200 Extender Kit
Transmitter (TX)
Input
(1) HDMI
Input Connector
(1) Type-A female HDMI
Output
(1) HDBT OUT
Output Connector
(1) RJ45
Control
(1) IR IN, (1) IR OUT, (1) RS232
Control Connector
(2) 3.5mm jacks, (1) 3-pin terminal block
Video Resolution
Up to 4Kx2K@60Hz 4:4:4 8bit
Receiver (RX)
Input
(1) HDBT IN
Input Connector
(1) RJ45
Output
(1) HDMI
Output Connector
(1) Type-A female HDMI
Control
(1) IR IN, (1) IR OUT, (1) RS232
Control Connector
(2) 3.5mm jacks, (1) 3-pin terminal block
Video Resolution
Up to 4Kx2K@60Hz 4:4:4 8bit

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General
Transmission Mode
HDBaseT
Transmission Distance
1080P@60Hz ≤ 230 feet (70 meters),
4K@60Hz ≤ 131 feet (40 meters)
HDMI Version
2.0
HDCP Version
2.2
Bandwidth
18Gbps
Power Consumption
14W (max)
Operation Temperature
-10℃~ +55℃
Storage Temperature
-25℃~ +70℃
Relative Humility
10%-90%
External Power Supply
Input Power: 12V DC 2A or Power over Cable (PoC),
AC Adaptor Input Power: 100~240VAC, 50/60Hz
Dimension (W*H*D)
115mm x 16mm x 84mm
Net Weight (g)
Transmitter/Receiver: 150g

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3. Panel Description
3.1 Matrix Switcher Front Panel
①Power LED: The LED illuminates red when the device is in standby, or
illuminates green when the device is powered on.
②SOURCE: Total nine buttons with blue backlight.
1-HDBT input selector / Left Key for On Screen Display control (OSD).
2-HDMI input selector / Right Key for OSD.
3-HDMI input selector / Up Key for OSD.
4-HDMI input selector / Down Key for OSD.
5-HDMI input selector.
6-VGA input selector.
7-DP input selector.
8-USB-C input selector / Enter key for OSD.
Auto switching mode selector. Press this to enter or exit automatic
switching mode. / Press and hold it at least 2 seconds to enable OSD menu.
③OUTPUTS: Two buttons with blue backlight.
1-HDMI output selector.
2-HDBT output selector.
④RESOLUTION: Two output video resolution selectors. Press the 1.HDMI or
2.HDBT button repeatedly to cycle through the four video resolutions. A series
of four LEDs, one of which illuminates blue to indicate which resolution is
selected.
8. USB-C1. HDBT 7. DP
5. HDMI 6. VGA4. HDMI 3. HDMI
2. HDMI
SOURCE
SELECT
MUTE/3s
MIX
HDBT OUT
HDMI OUT
VOLUME
1. HDMI
OUTPUTS
1920x1200
4K@30Hz
4K@60Hz
1080P
RESOLUTION
1920x1200
4K@30Hz
4K@60Hz
1080P
ENTER MENU/2s
PT-PMS-82S
Presentation Matrix
1234 5

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⑤VOLUME:
Press the volume knob in to toggle among MIX, HDMI OUT and HDBT OUT
audio control, and the corresponding LED will illuminate blue.
Rotate the knob to increase or decrease the volume of the selected audio.
Press and hold the knob at least three seconds to mute the selected audio.
Rotate the knob to unmute.
3.2 Matrix Switcher Rear Panel
①INPUT: Total eight video inputs, five audio inputs and one IR input.
1-HDBT: RJ45 port to connect the PT-HDBT-200-TX transmitter to receive
AV signal, IR and RS232 control signal, and one external balanced audio
input (5-pin) can be embedded in the HDBT video. In addition, the HDBT
input supports 24V PoC.
2-HDMI: Type-A female HDMI port to connect the HDMI source. One
external balanced audio input (5-pin) can be embedded in the HDMI video.
3-HDMI: Type-A female HDMI port to connect the HDMI source. One
external balanced audio input (5-pin) can be embedded in the HDMI video.
4-HDMI: Type-A female HDMI port to connect the HDMI source.
5-HDMI: Type-A female HDMI port to connect the HDMI source.
6-VGA: 15-pin female VGA port to connect the VGA source. One stereo
auxiliary audio input (3.5mm jack) can be embedded in the VGA video.
7-DP:Type-A female DP port to connect the DP source.
6. VGA 8. USB-CAUDIO 7. DP DC 24V
OUTPUTS
2. HDBT IR IN 1. HDMI
TCP/IP
CONTROL
IR EYE FIRMWARE
1
L R L R
IR OUT
2. HDMI
5. HDMI4. HDMI
2. HDMI 3. HDMI 1. HDBT
IR IN
L R L RL R
MIX
L R
INPUTS
2RS232
Tx Rx
RELAY1
NO COM N C
RELAY2
NO COM N C
AUDIO OUT
1
25
34

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8-USB-C: Type-C USB port to connect the device with SlimPort output, e.g.
Macbook.
IR IN: 3.5mm jack to connect the IR receiver for IR pass-through.
MIX: 5-pin terminal block to connect the audio source for global audio
mixing.
②OUTPUT:
1-HDMI: Type-A female HDMI port to connect the video display.
2-HDMI: Type-A female HDMI port to connect the video display.
2-HDBT: RJ45 port to connect the PT-HDBT-200-RX receiver to transmit AV
signal, IR and RS232 control signal. The HDBT output supports 24V PoC.
Note: The 2-HDMI and 2-HDBT ports output the same signal.
IR IN: 3.5mm jack to connect the IR receiver for IR pass-through.
IR OUT: 3.5mm jack to connect the IR emitter for IR pass-through.
③AUDIO OUTPUT:
1: One balanced audio output (5-pin) and one digital SPDIF audio output for
1-HDMI output audio de-embedding.
2: One balanced audio output (5-pin) and one digital SPDIF audio output for
2-HDBT output audio de-embedding.
④CONTROL:
RS232: 3-pin terminal block to connect the control device (e.g. PC) to
control the switcher by sending RS232 commands. It also supports RS232
pass-through control.
RELAY 1-2: Two 3-pin terminal blocks to connect the relay devices (e.g.
projector screen).
IR EYE: 3.5mm jack to connect IR receiver to control the switcher by the IR
remote.
TCP/IP: RJ45 port to connect the control device (e.g. PC) to control the
switcher by GUI.
FIRMWARE: Type-A USB port for firmware upgrade.
⑤DC 24V: DC barrel connector for the power adapter connection.

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3.3 Transmitter Front and Rear Panel
①MODE SWITCH: Put the Mode switch in the CTRL position for normal operation
and to allow RS232 control pass-through. Put the switch in the UPDATE A
position to update the Valens IC program. Finally, put the switch in the UPDATE
Bposition to update the compression IC program.
②POWER LED: The LED illuminates red when power is applied.
③HDMI IN: Type-A female HDMI port to connect the HDMI source.
④RS232: 3-pin terminal block to connect the RS232 control device (e.g. PC) or a
device to be controlled by RS232 commands.
⑤IR IN: 3.5mm jack to connect the IR receiver for IR pass-through.
⑥IR OUT: 3.5mm jack to connect the IR emitter for IR pass-through.
⑦HDBT OUT: RJ45 port to connect the HDBT IN port of switcher by CATx Ethernet
cable.
⑧DC 12V: DC barrel connector for the power adapter connection.
CTRL
UPDATE B UPDATE A
Tx Rx DC 12V
IROUT IRIN
HDBT OUT
HDMIIN
12345678

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3.4 Receiver Front and Rear Panel
①MODE SWITCH: Put the Mode switch in the CTRL position for normal operation
and to allow RS232 control pass-through. Put the switch in the UPDATE A
position to update the Valens IC program. Finally, put the switch in the UPDATE
Bposition to update the compression IC program.
②POWER LED: The LED illuminates red when power is applied.
③HDMI OUT: Type-A female HDMI port to connect the display device.
④RS232: 3-pin terminal block to connect the RS232 control device (e.g. PC) or a
device to be controlled by RS232 commands.
⑤IR IN: 3.5mm jack to connect the IR receiver for IR pass-through.
⑥IR OUT: 3.5mm jack to connect the IR emitter for IR pass-through.
⑦HDBT IN: RJ45 port to connect the HDBT OUT port of switcher by CATx Ethernet
cable.
⑧DC 12V: DC barrel connector for the power adapter connection.
CTRL
UPDATE B UPDATE A
DC 12V
Tx Rx
HDMIOUT
HDBT IN
IROUT
IRIN
12345678

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4. System Connection
4.1 Usage Precaution
Make sure all components and accessories included before installation.
System should be installed in a clean environment with proper temperature and
humidity.
All of the power switches, plugs, sockets, and power cords should be insulated
and safe.
All devices should be connected before power on.
4.2 System Diagram
6. VGA 8. USB-CAUDIO 7. DP DC 24V
OUTPUTS
2. HDBT IR IN1. HDMI
TCP/IP
CONTROL
IR EYE FIRMWARE
1
L R L R
IR OUT2. HDMI5. HDMI4. HDMI2. HDMI 3. HDMI1.HDBTIR IN
L R L RL R
MIX
L R
INPUTS
2RS232
Tx Rx
RELAY1
NO COM NC
RELAY2
NO COM NC
AUDIO OUT
Blu-Ray DVD
HDMI 2.0 Transmitter
Game Console
PC
MacBooK
Cellphone
RS232
Tx Rx
IR
STEREO BRIDGE
MONO
LR
MIC
LINE48V
MIC 1 2
INPUTS
Audio Player
Speaker Amplifier Soundbar
HDTV Project ScreenProjector HDTV HDMI 2.0 Receiver
5.HDMI 4.HDMI 6.VGA
OK
2.HDBT BLACK
Wireless Router iPad
IR
Receiver
Remote
Central
Control System
4K 40m,1080P 70m
4K 40m,1080P 70m
DP:
VGA:
HDMI:
Control:
Ethernet:
Audio:
HDBaseT:
USB-C:

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5. Button Control
5.1 Manual Switching
When the switcher is in manual switching mode, the AUTO button LED goes out.
Please following the below steps to switch input source to output channel.
1) Press any one of eight input buttons to select input source, and the
corresponding button LED turns blue.
2) Press either 1-HDMI or 2-HDBT output button to select output channel, and the
corresponding button LED turns blue.
3) Press the input button again to confirm switching setting, otherwise, it will
automatically confirm after three seconds.
5.2 Automatic Switching
Please following the below steps to enable auto switching mode for 1-HDMI or
2-HDBT output.
1) Press AUTO, and the button LED turns blue.
2) Press either 1-HDMI or 2-HDBT output button, and the corresponding button LED
turns blue.
3) Press AUTO button again to confirm the setting, otherwise, it will automatically
confirm after three seconds.
4) Repeat the above three steps can exit auto mode, but the input source will
remain the current setting.
Note: The AUTO button LED illuminates blue when the 1-HDMI output is in auto mode
or the 2-HDBT output in auto mode.

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When in auto mode, the switcher will switch according to the following rules:
The switcher will switch to the first available active input starting at input 1 to 8.
New input: The switcher will automatically select the new input once detecting a
new input.
Reboot: If power is restored to the switcher, it will automatically reconnect the
input before powered off.
Source removed: When an active source is removed, the switcher will switch to the
first available active input starting at 1-HDBT input.
In auto mode, the input source also can be switched by the manual switching steps.
5.3 Resolution Selection
Press the 1.HDMI or 2.HDBT button on RESOLUTION area repeatedly to cycle
through the four video resolutions. A series of four LEDs, one of which illuminates
blue to indicate which resolution is selected.
5.4 Sound Volume Control
Press volume knob to choose MIX, HDMI OUT or HDBT OUT audio needs to be
adjusted, the corresponding LED will turn blue and keep on.
Adjusting the knob in clockwise direction to increase sound volume.
Adjusting the knob in anti-clockwise direction to decrease sound volume.
Press and hold the knob at least three seconds to mute the selected audio. Rotate the
knob to unmute.