RPN-67 NP

I got one of these in 1978 and discovered RPN. I have never used anything but RPN calculators since. I agree that the audible key clicks can be annoying, but I usually keep the sound turned off on my iPad anyway. This is a great emulation of my long dead HP67.

This is a beautifully written tribute to the original, that almost perfectly follows every function. So why does it make an annoying noise whenever you touch a key? Is this a plot from TI? Seriously, who would ever want this? It stinks! Please add the option to turn off the "clicking" sounds.

What an application! Perfect visual experience, perfect emulation, even the clicks are pleasant. I'll be buying the Pro version for sure. This has to be the most underrated developer in the IOS world. Had only two minor suggestions: The h reg function to display registers zips through too fast (I realise it is redundant), and the legends on the lower surfaces of the lower keys are barely visible. Could you also display the back label? Also, a version for OSX is sorely needed.