"What I wanted to bring your attention to is that the numbers are duplicated - there’s a number on the actual button and then a raised number above the button.
My guess is that due to the nature of the intended use of the raised number - that is, to be read through touch - that if the raised letter were on the button then a person may accidentally trigger the button whilst attempting to read the button and figure out what the button will do once pressed."
How, though, does a visually-impared user know if the label is above or below the button they want to push?
"Korg EA-1 Mk II analog modeling synthesizer. Portamento is how quickly it changes pitch so you can play it like a piano or make it sound like a siren. The rest is for the two oscilloscopes and the type of each and how they interact with each other (modulation). Also can patch in the audio in, instead of Osc 1."
You know, the ergonomics of these kind of suck. If you are elderly, how do you reach up to adjust the air flow? It requires some detail hand work and these things never work very well--it is difficult to get the right flow of air aimed in the right place. Especially since you have to change your position to adjust the air, then when you sit down you have to test to see whether it is hitting the right spot on you or not, often requiring more adjustment, etc.
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