Details about the Mango Studios 757 Sound Pack:

New and higher quality cockpit warnings, such as Master Warning, Master Caution, and EGPWS
Custom Cockpit system sound effects, including Battery, Avionics, Gyro, Packs, coming on sound.
Custom Switches, Buttons, Covers, Rotaries, and Knob sound effects for the entirety of the cockpit.
Realistic Cabin sound effects, including hydraulic systems, flap retraction, and flap extension, fuel systems, passenger sound effects, and engine rumble/jet blast.
Custom and realistic RB-211 Roll Royce engine sound effects, that now include jet blast rumble sound effects.
Custom and realistic PW-2000 Pratt & Whitney engine sound effects, that now include jet blast sound effects.
New custom cockpit environment effects, such as the Rotate Effects, Wind in the cockpit, that gets louder the faster the aircraft goes, and the Speed Brakes up effects.
Exterior Sounds, such as the Fuel Truck, Ground Power Unit, and Auxiliary Power Unit (APU), have been customized, remade, and adapted for the 757.
Exterior Weather Sounds, such as thunder, rain, hail, has been customized for the 757.
Interior Weather sounds, such as rain in the cockpit, have been customized for the amount of rain that is present. (Can range from soft rain to hard rain, depending on how hard it is raining)

All new custom Mango Studios User Interface that allows having more control and customization over your sound pack than the previous A350 sound pack.