This is just a fun project for myself I have been working on for a few days. I did something similar for the 757 but stopped distributing it once it was brought to my attention that one of the sounds that was given to me was from another developer. I made a completely overhauled version for both the 757 and 767 and all the logics are exactly as Boeing says they are (I did all my research).

All sounds are either from video recordings, recorded by me, recorded by airline maintenance technicians (Steve), audio recordings from other airline personnel, or from my talented friend Nick. (Everyone has given me permission to make a video)

Gauge Limitation: It can have trouble transitioning from start sounds to loop sounds on slower systems, so you may hear a few milliseconds of a pause between sounds, nothing you can do to fix it.

Yes!!!!! I know you can't hear a hydraulic or fuel pump from the cockpit, I made them very loud for the video and they're to only be heard from the cabin once I get that all set up.

https://youtu.be/lUJG24rSuto

List of sounds:
Battery (Inside Only)
Standby Power (Inside Only)
Equipment Cooling (Outside and Inside)
Fuel Pumps (Outside and Inside [optional] )
Hydraulic Pumps (Air and Elec) (Outside and Inside [optional] )
APU (Outside Only)
Gear/Flap/Speedbrake Drag Rumble (Outside and Inside)

757/767 - Drag rumble with gear/speedbrakes extended, or flaps greater than 20 degrees! silent at 110KTAS and gets loudest at 350KTAS

757/767 - Bus source change sound happens exactly as real life in priority order of the bus source (GPU, on-side IDG, APU, cross-side IDG, off) So when you start an engine, you'll hear the usual "clunk" sound as each respective AC Bus changes sources

767 - Air driven hydraulic pump follows all exact logics (except for the 15 second delay when it's used to help out the primary pumps) including: flap extension/retraction on the ground, liftoff to gear up, flap retraction in the air, from flaps extension until speedbrakes stowed after landing

757/767 - Flap motor only comes on when flaps are actually moving, not with the slats

757/767 - Gyro sound only comes on when the appropriate bus is powered