You’ll find it here, on my instagram account.
If you’re not on instagram: just let me know (send me an email) and if there’s enough interest I can post a little video on my website as well.
EDIT! Thank you for all your wonderful emails! Now I’ve added the video: see below!
Btw I learnt this pranayam from Julie Martin and Emil Wendel at Brahmani Yoga here in Goa many years ago and it’s STILL my favourite!