Updated Garmin 340 Audio Panel for XP, FSX & FS2020

[FlyerDavidUK]

I have made some minor updates to the popular Garmin GMA 340 audio panel found in many GA aircraft.

Specifically:
- Modified the behaviour of the COM1 and COM2 mic buttons so that when both COM1 and COM2 monitor are active, then both remain on
- Added operation of the COM1/2 Split, PA, Crew and Pilot isolation buttons, although none of these features are supported by any simulator today
- Added operation of the Speaker button/light. This is partially supported by FS2020 (output from sim only) so will also light up under control of the simulator
- Restored requirement for Avionics Master to be switched on (as is the norm)
- Tested with X-plane 11, FSX and FS2020

I'd appreciate if others could check this out and confirm operation matches that of the real world before I submit to the community library.
Also needs testing with P3D but I don't expect any issues.

Generic - Garmin 340 Audio Panel.siff

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[Mickolodias]

Works great in XP12. No idea if the unsupported buttons match real world, but seems logical to me.

[Crunchmeister]

I briefly played with it in MSFS and it seems to function as intended. Didn't test all the functions in full detail though. Will report back if I find any issues.

[FlyerDavidUK]

Thanks for the help. I have made some further refinements to include adding the missing graphics/volume control text; power-on self-test to briefly illuminate all the lights; configuration option to display square or rounded corners.

I think this just about matches real-world operation as far as any of today's simulators support it.

I have submitted this to the library, so hopefully will see it available for everyone before too long.