Conversation so far:
What is the new Curved Air?
Having retained a good working relationship, Sonja Kristina and Mike Wedgwood formed a new band with Kirby Gregory (electric guitar), Eddie Jobson (keyboards, violin), and Jim Russell (drums).
Were the new Curved Air lineup more popular than the former Curved Air?
The new Curved Air's sole album, Air Cut, failed to chart at the time.
Did the new Curved Air dissolve after failing to chart with their sole album?
Not long after the release Eddie Jobson was asked to replace Brian Eno in Roxy Music, so Kirby Gregory and Jim Russell both left the group to form Stretch.
Is Stretch the new name fo the new Curved Air lineup?
Kirby Gregory(electric guitar) and Jim Russell(drums) both left the new Curved Air to form Stretch.

Question: How did that demo do?
Self-contained rewrite: How did the demo tape that Sonja Kristina do?