Nice program
Can do all my custom blends of trimix and nitrox. When making a lean trimix via a top-off from a banked nitrox and air, you will have to guess the the final helium content of the mix to where you are only "adding" ~5 psi of helium in order to get a calculated result.
To have the program do this would be nice, but would add another level of complexity.
R. Martelli about
Trimix Tools, v1.4