hmmm ... not even sure if you can use the track 2 on the legacy port ... don't that option exists but beside that :
- the legacy port has a 48k sample rate limit
- aes on the HD interfaces supports 96k single wire which the track 2 I'm sure is compatible with
I realy don't see any advantage in using the legacy port ... if the card to support that for the track 2 would exist. Not worth the investment. Except if you're desparate on keeping the aes inputs on the HD interface available for other stuff.