Backfire sounds

Hello, I'm trying to add some backfire animation using the flames and flame_presets, but I don't want to hear the backfire sounds that adds when you add the backfire animation, how can I change that?
Here's how I have the inis:

Code:
[HEADER]
EDIT_MODE=0
INTENSITY=10
EDIT_BIG=0
BURN_FUEL_MULT=1
FLASH_THRESHOLD=1
EDIT_STATE=0

[FLAME_0]
POSITION=-0.06, 0.260, -2.05
DIRECTION=0.0,0.0,-1
VSIZE_START=0.15
VSIZE_END=0.05
LSIZE=0.5
SIZE_MULT=1
IS_LEFT=1
GROUP=0

[FLAME_1]
POSITION=0.1, 0.260, -2.05
DIRECTION=0.0,0.0,-1
VSIZE_START=0.15
VSIZE_END=0.05
LSIZE=0.5
SIZE_MULT=1
IS_LEFT=0
GROUP=0

[FLAME_2]
POSITION=-0.06, 0.260, -2.05
DIRECTION=0.0,0.0,-1
VSIZE_START=0.1
VSIZE_END=0.075
LSIZE=0.9
SIZE_MULT=1.5
IS_LEFT=1
GROUP=0

[FLAME_3]
POSITION=0.1, 0.260, -2.05
DIRECTION=0.0,0.0,-1
VSIZE_START=0.1
VSIZE_END=0.075
LSIZE=0.9
SIZE_MULT=1.5
IS_LEFT=0
GROUP=0
Code:
[HEADER]
SIZE_MULT=2

[PRESET_START_0]
TRIGGER=0
OFFSET=0.0,0.0,0.02
SIZE=0.05
TYPE=0
RGB=0,0,95,0.2

[PRESET_START_1]
TRIGGER=1
OFFSET=0.0,0.0,0.1
SIZE=0.1
TYPE=1
RGB=0,0,90,0.07

[PRESET_START_2]
TRIGGER=2
OFFSET=0.0,0.0,0.08
SIZE=0.07
TYPE=0
RGB=0,0,90,0.08

[PRESET_END_0]
TRIGGER=0
OFFSET=0.0,0.0,0.02
SIZE=0.06
TYPE=1
RGB=255,120,0,0.1


[PRESET_END_1]
TRIGGER=1
OFFSET=0.0,0.0,0.06
SIZE=0.04
TYPE=1
RGB=255,100,0,0.07


[PRESET_END_2]
TRIGGER=2
OFFSET=0.0,0.0,0.1
SIZE=0.04
TYPE=2
RGB=255,110,0,0.05


[PRESET_LOOP_0]
TRIGGER=0
OFFSET=0.0,-0.01,0.18
SIZE=0.13
TYPE=1
RGB=128,30,0,0.1


[PRESET_LOOP_1]
TRIGGER=1
OFFSET=0.0,-0.04,0.26
SIZE=0.13
TYPE=1
RGB=128,30,0,0.06


[PRESET_LOOP_2]
TRIGGER=2
OFFSET=0.0,-0.06,0.35
SIZE=0.15
TYPE=2
RGB=128,30,0,0.05


[PRESET_FLASH_0]
TRIGGER=3
OFFSET=0.0,-0.00,0.18
SIZE=0.10
TYPE=0
RGB=100,50,0.09

[PRESET_FLASH_1]
TRIGGER=3
OFFSET=0.0,-0.00, 0.03
SIZE=0.08
TYPE=2
RGB=100,50,0,0.09

[PRESET_FLASH_2]
TRIGGER=3
OFFSET=0.0,-0.0,0.1
SIZE=0.14
TYPE=1
RGB=100,50,0,0.09
Code:
[SKIDS]
ENTRY_POINT=0.45
MIX_VOLUME=0.62                ; global volume of tire squeel sound
PITCH_BASE=0.5
PITCH_GAIN=0.15

[WIND]
SPEED_GAIN_0=0                 ; Volume increase for every kmh
SPEED_GAIN_1=0.0003   ; Volume increase for squared kmh
VOLUME_GAIN=0.7               ; Maximum volume reached by the wind (DO NOT EXCEEED 1.0)
PITCH_REFERENCE=50        ; Reference speed (in kmh) for speed variation
PITCH_GAIN=0.3                 ; Pitching gain for speed variation

[TYRE_ROLLING]
SPEED_GAIN_0=0.0015
SPEED_GAIN_1=0.0001
VOLUME_GAIN=0.8
PITCH_REFERENCE=45
PITCH_GAIN=0.2

[BACKFIRE]
MAXGAS=0.4
MINRPM=4500
MAXRPM=8000
TRIGGERGAS=0.8
VOLUME_IN=0
VOLUME_OUT=0
VOLUME_SCALE_OUT=0

[BODY_WORK]
MIN=0.2
GAIN=1

[ENGINE]
POSITION=front
 
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