I haven't even been able to export to 2.1 successfully let alone try to import to Helix.
Where is the location of the audio file when you exported? Helix might expect it to be in the location typically used for Vixen 2.1 data.
I created a seq with Vixen 2.1 and it works. I then created one in V3 using the same audio file in the same folder as I did in Vixen 2.1. I exported the file in V3 to the same sequence folder that Vixen 2.1 uses and I still get the "audio file associated with this file could not be found" error. I also tried putting everything in the V3 folders then mapping HNS to those folders but got the same thing.
I was able to export to Vixen 2.1 and to Helix Network Supervisor. I haven't yet tried to run it on my Helix yet. thanks for all the work and for all the work you've now created for me...yikes..only a couple of months to get everything ready.