Many thanks for this! I have been using Van Biezen (a variant of Valotti) to tune the harpsichord for many years, but I'll be using the Haugsand tuning system from now on. What is the iPhone tuning application you use here? You mentioned it by name (around 1:51 or so), but I could not really hear what you said.
Damn! I went out and bought a Korg OT-120 to tune my spinet and Jägermeister or Haugsand 3.5 isn't in it anywhere (but Vallotti is :)). Money down the drain - bugga!