Max, just a few thoughts on this topic.
I think there are many customers who buy the new devices to get the "latest and greatest" with an option for AVB in the future, but still have MADI and not concrete plans for switching to AVB.
Wouldn't it be possible to make the behaviour of AVB devices configurable, to either stay on a clock in favour of AVB (like it is now) or to follow the MADI clock ? I think there are enough customers still recording in single speed, then this would support the most used sample rates for audio and video: 44.1 and 48 kHz.
Not sure, but perhaps it could even be detected automatically, whether an AVB stream is active or not, as you need network addresses for sender and receiver, maybe even that would not be too hard.
Or are there still 1-2 MADI bits free for a RME unique solution to tell the MAID devices on a bus, whether single, double or quad speed is in use? Even 1 bit would make it possible to differentiate between single and double speed which is already a very nice range of 44.1 - 96 kHz (assuming only very few ppl use 192 kHz).
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