With patch, you can alter volume or pitch of specific audio events, alter events’ input parameters, or use extra parameters in your soundbank.

Syntax

That’s how volumes can be adjusted:

[AUDIO_VOLUME]
ENGINE_EXT = 1.0
ENGINE_INT = 1.0
GEAR_EXT = 1.0
GEAR_INT = 1.0
BODYWORK = 1.0
WIND = 1.0
DIRT = 1.0
DOWN_SHIFT = 1.0
HORN = 1.0
GEAR_GRIND = 1.0
BACKFIRE_EXT = 1.0
BACKFIRE_INT = 1.0
TRACTION_CONTROL_EXT = 1.0
TRACTION_CONTROL_INT = 1.0
TRANSMISSION = 1.0
LIMITER = 1.0
TURBO = 1.0

; New options added in 0.1.67:
HIT = 1.0
SCRAPE = 1.0
WHEEL = 1.0
SKID_EXT = 1.0
SKID_INT = 1.0

Similarly, pitch can be adjusted as well (added in 0.1.67):

[AUDIO_PITCH]
ENGINE_EXT = 1.0
ENGINE_INT = 1.0
GEAR_EXT = 1.0
GEAR_INT = 1.0
BODYWORK = 1.0
WIND = 1.0
DIRT = 1.0
DOWN_SHIFT = 1.0
HORN = 1.0
GEAR_GRIND = 1.0
BACKFIRE_EXT = 1.0
BACKFIRE_INT = 1.0
TRACTION_CONTROL_EXT = 1.0
TRACTION_CONTROL_INT = 1.0
TRANSMISSION = 1.0
LIMITER = 1.0
TURBO = 1.0
HIT = 1.0
SCRAPE = 1.0
WHEEL = 1.0
SKID_EXT = 1.0
SKID_INT = 1.0

Also, since 0.1.67 you can apply LUTs to input parameters like so:

[AUDIO_PARAMETER_TRANSFORM]
; Originally, AC would sent 10000 to soundbank, but now it’ll send 5000 instead. Or, 
; it’ll send 2500 instead of 5000 — values in-between these points are linearly interpolated.
ENGINE_EXT_RPMS = (| 0=0 | 10000=5000 |)

Supported parameters:

• ENGINE_EXT: ENGINE_EXT_RPMS, ENGINE_EXT_THROTTLE;
• ENGINE_INT: ENGINE_INT_RPMS, ENGINE_INT_THROTTLE;
• GEAR_EXT: GEAR_EXT_STATE;
• GEAR_INT: GEAR_INT_STATE;
• BODYWORK: BODYWORK_SUSP_TRAVEL_SPEED;
• WIND: WIND_SPEED, WIND_AIR_PRESSURE;
• DIRT: DIRT_SPEED, DIRT_DIRTINESS;
• BACKFIRE_EXT: BACKFIRE_EXT_THROTTLE;
• BACKFIRE_INT: BACKFIRE_INT_THROTTLE;
• TRACTION_CONTROL_EXT: TRACTION_CONTROL_EXT_DECAY;
• TRACTION_CONTROL_INT: TRACTION_CONTROL_INT_DECAY;
• TRANSMISSION: TRANSMISSION_DRIVETRAIN_SPEED, TRANSMISSION_THROTTLE;
• LIMITER: LIMITER_DECAY;
• TURBO: TURBO_BOOST, TURBO_BOV, TURBO_BOV_DECAY;
• HIT: HIT_IMPACT_ANGLE, HIT_IMPACT_SPEED;
• SCRAPE: SCRAPE_SPEED, SCRAPE_DECAY;
• WHEEL: WHEEL_BRAKE, WHEEL_SPEED, "WHEEL_INFLATION, WHEEL_SUSPENSION_DAMAGE.

Another feature is that you can add new parameters in audio soundbanks:

[AUDIO_PROPERTIES]
TURBO_THROTTLE = 1    ; for turbo sound, “throttle” input, same as in engine event
ENGINE_EXT_BOOST = 1  ; for exterior engine sound, “boost” input, same as in turbo event
ENGINE_INT_BOOST = 1  ; for interior engine sound, “boost” input, same as in turbo event

New sound events

Patch adds new car sound event as well:

• /transmission_ext: similar to transmission event, but for exterior;
  • Parameters: drivetrain_speed and throttle, same as with transmission event.

Also, there are some events which could be customized in soundbank, but if they’re missing, generic ones will be used:

• /wiper_ext: sound of moving wipers car for exterior cameras;
  • Parameters: state for animation status, to sync wipers movement with sound;
• /wiper_int: sound of moving wipers car for interior cameras;
  • Parameters: state for animation status, to sync wipers movement with sound.

Features to add later

• More events to adjust;
• New car sound events (?);
• More parameters for new soundbanks (?).