v1.4.4
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- Increased engine volume 1dB.
- Increased engine idle 0.5dB.
- Reduced exhaust idle 0.5dB for better blending.
- Increased air dump sound by 2dB.
- Adjusted the pitch of the engine sound when the jake it active.
- Smoothened the falloff for the jake turbo when its approaching its cutoff point.

v1.4.3
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- The burble is back by adjusting the pitch of the lower loaded exhaust sounds (the high ones remain as it was from 1.4.2).
- Adjusted the pitch of the unloaded exhaust sounds to suit.
- Adjusted the pitch of the loaded intake sounds to suit.
- Increased turbo volume 1dB.

v1.4.2
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- As requested, reverted back to v1.4.1 with following changes...
- Adjusted the engine/exhaust seek ascending/decending speeds
- Loaded exhaust sounds now gradually builds up, instead of being almost instant, while not loosing the exhaust blurb on down shifts.
- Fixed an issue were sounds would sometimes flicker on/off when the volume of that sound was really low.
- Increased stationary rev limit.
- Removed directional sound cone from engine.
- Increased turbo volume 1dB.
- Improved the audio quality on all sound files.

Reverted as requested

v1.5.1
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- Improved the exhaust transitions around the 1500RPM mark
- Adjusted the exhaust pitch slightly around the 1500-2100RPM mark
- Added more bass frequencies to the exhaust
- Improved the transiton from start to idle
- Increased turbo volume 1dB
- Removed directional sound cone from engine
- Other balancing tweaks to suit above changes

v1.5
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- Completely reworked the exhaust sounds and pitch.
- Various other tweaks and balances to suit the above change.
- Loaded exhaust sounds now gradually builds up, instead of being almost instant, while not loosing the exhaust blurb on down shifts.
- Improved the audio quality on all sound files.
- Removed some audio files that didn't make any impact to the overall sound in order to lower the footprint.
- Fixed an issue were sounds would sometimes flicker on/off when the volume of that sound was really low.
- Increased stationary rev limit.

v1.4.1
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- Blow-off sound now realistically fades out when the engine become loaded again. This also prevents the blow-off from sounding inadvertently.
- Increased volume of blow-off by 1dB's
- Increased volume of turbo by 1dB's
- Added support for Peterbilt 386

v1.4
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- Added brand new loaded engine audio.
- Adjusted the loaded/unloaded volume curve, which produces a better sound when down shifting.
- Adjusted the trigger for the sound of the blow off so it is more reliable (still not perfect though).
- Adjusted the seek speed for the jake brake so that its entry sounds more realistic.
- Added brand new turbo sound effects.
- Adjusted low torque curves so that the engine can now be stalled (thanks to Johnny_Cash for assistance)
- Added realistic engine pricing.
- Added 800HP engine.