The pianoscope app is a great help and I was thrilled with early results, feeling it was a vast improvement on the state of the tuning after the last visit from a professional tuner.
However I am finding my 1922 Bechstein model A does not hold its tune very well, especially after extended playing with other musicians. In the (very lively reverb) room it sounds fine but when I record it the results are dreadful - unless I am being unfair by comparing it to my Nord Stage 2.
I record with 2 Aston starlights and a Neumann U87ai.
The strings also click when tuning so that I go from flat to sharp and back to flat again. After a long fight I finally get a decent sound, but a few days later some notes go out by up to 5%.
Has anyone any ideas? Might it settle down if I keep tuning every few days?