It simply doesn't work for me, the tuning result sounds completely 'Off' all over.
Have I overlooked something?
This is TuneLab 2.6 on an Android device.
You have not said what interval settings you have to 3-part tuning. You might have accidentally set them in a very unusual way. Others have already made some reasonable suggestions that suit their preferences. Or you could just return to the defaults of 8:4 for the bass, 4:2 for the middle, and 4:1 for the treble.
The current settings for the not so nice 3 part tuning on the Steinway B are set to Bass Interval 6:3, Middle Interval 8:4 (A3-A4) and Treble Interval set to 3:1 - looks like this is the main culprit.
My private reference piano is this old Steinway B and I like the 2 part tuning as a result of 4:1 Bass and 6:3 Treble very much:https://drive.google.com/file/d/1p5AixvnxvvM_J8j7p2Cmyiv4DsJk4dvH/view?usp=sharing
I now checked some of the things I did, so thanks to everyone who shared his advice and experience.
First, I will take the defaults (Just checked and those are the defaults anyway, so didn't change anything there accidentally) as you've stated them and then see, where this takes me.
I will then experiment with a different three part tuning and change the middle interval from E3-B4, edit measure sequence to A0, C1-6 and F#1-6 and measure inharmonicity at all break points in addition to that. We'll see where that takes me. Will first do this on the Steinway this week and probably on the 260 Erard next week which needs tuning anyway.