Mic talk-over, E talk-over is not active, see, Program audio ducking level in talk over – Extron Electronics MPS 409 User Manual
Page 30: Eshold level. see

Command
ASCII Command
(host to switcher)
Response
(switcher to host)
Description
Switcher-
initiated
messages
Program audio ducking level in talk over mode
Adjust audio ducking level
X1@
* 58#
Adl
X1@
]
Adjusts how much
(
X1@
= 0 to 30 dB) the program
audio ducks (automatically
decreases) in talk over mode.
0 = ducking off.
Increment audio ducking
+*58#
Adl
X1@
]
Decrement audio ducking
–*58#
Adl
X1@
]
View audio ducking level
58#
X1@
]
Volume level
Specify volume variable
X1)
V/v
Vol
X1)
]
Volume level is
X1)
.
X1)
= 000 – 100 (program
volume adjustment range).
X
Increment volume
+V
Vol
X1) ]
Volume level is
X1)
.
Decrement volume
–V
Vol
X1) ]
Volume level is
X1)
.
View volume
V
X1) ]
Volume level is
X1)
.
Audio mute
X#
Z/z
Amt
X# ]
X#
: 0 = off and 1 = on.
X
View audio mute status
Z/z
X# ]
Mute status is (0=off, 1=on).
Mic level
Specify gain
16*
X$
G
Aud
X$
]
X$
= audio gain in dB = 0 to
12. this variable is a positive
number.
X
Specify attenuation
16*
X%
g
Aud
X%
]
X%
= attenuation in dB = 1 to
66. this variable is a positive
number.
View mic volume
16G/g
X^
]
X^
= overall mic gain or
attenuation between -66 dB
and +12 dB. this response
variable indicates attenuation as
a negative number and gain as
a positive number.
Mic mute on/off
turn mic mute on/off
X#
M/m
Mix
X#
]
toggles mic mute on or off.
X#
: 0 = off, 1 = on.
X
View mic mute status
M/m
X#
]
Mic mute status: (0=off, 1=on).
Mic talk-over threshold
Display talk-over threshold
X*
* 2 #
thr
X*
]
Shows the mic threshold
number.
X*
= 0 through 15,
default = 8.
Decrement threshold
– * 2#
thr
X*
]
Decrements mic threshold one
step.
Increment threshold
+ * 2#
thr
X*
]
Increments mic threshold one
step.
View mic talk threshold
2 #
X*
]
MPS 409 • SIS Programming and Control
24