I found two legs on the ic7 (MIC5504) had not been soldered! Soldering them down has fixed the line hold problem. I now behaves exactly the same as when using my aurora
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I'm still having problems with the sound upsetting the picture but with the gain set low it's not too bad (as long as nobody screams!). I need to get on with my second HH so I can compare the two.
While I had the opportunity I flashed the firmware to V05 but I notice that two test tones are back on the front switch and the 16:9 input has gone. Was this intentional?
Regards
David