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One question - Why is the bit mask set the way it is?
Radio audio switches. Read/write bit settings as follows:
2^7 COM1 transmit
2^6 COM2 transmit
2^5 COM receive both
2^4 NAV1 sound
2^3 NAV2 sound
2^2 Marker sound
2^1 DME sound
2^0 ADF1 sound
Would a Discord session with someone help?