jaco, a user on avforums told me the following:

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Just checked and mine is V1.6c. The problems I have are currently:-

a) when it engages with sound I get a horrible crackle sound for a second.

b) connecting it to any device in the chain with DVI (such as my Lumagen scaler), disables the audio.
And:

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Just spoke to Lektropacks and mentioned the later firmware V1.8c and the crackle I had on mine. They said there had been some reports of this, so she said sent it in, and we'll send you the later revision.
I will be very interested to find out if the source switching crackle is resolved with your V1.8C firmware. Please report!

Joel

Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.