This question and its answers are because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions.I have problems and have tried 30 different computer keyboards which all caused me pain. Playing piano does not cause me pain. I have played piano for around 20 years without any pain issues. I would like to know if there is a way to capture MIDI from a MIDI keyboard and output keyboard strokes.

I know nothing at all about MIDI but I would like some guidance on how to convert this signal into a keystroke. I haven't done any MIDI programming in years, but your fundamental idea is very sound (no pun).MIDI is a stream of 'events' (or 'messages'), two of the most fundamental being 'note on' and 'note off' which carry with them the note number (0 = C five octaves below middle C, through 127 = G five octaves above the G above middle C, in semi-tones). These events carry a 'velocity' number on keyboards that are velocity sensitive ('touch sensitive'), with a force of (you guessed it) between 0 and 127.Between velocity, chording, and the pedals, I'd think you could come up with quite a good 'typing' interface for the piano keyboard. Chording in particular could be a very powerful technique — as I mentioned in the comments, it's why rank-and-file stenographers can use a to keep up with people talking for hours in a row, when even top-flight typists wouldn't be able to for any length of time via normal typewriter-style keyboards. As with machine stenography, you'd need a 'dictionary' of the meanings of chords and sequences of chords. (Can you tell I used to work in the software side of machine stenography?)To do this, the fundamental pieces are:.

Receiving MIDI input. Don't try to do this yourself, use a library. Edit: Apparently, the Java Sound API, including receiving events from MIDI controllers. May also be useful. Converting that data into the keystrokes you want to send, e.g.

Via the dictionary I mentioned above. Outputting the keystrokes to the computer.To be most broadly-compatible with software, you'd have to write this as a keyboard device driver. This is a plug-in to the operating system that serves as a source for keyboard events, talking to the underlying hardware (in your case, the piano keyboard).

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For Windows and Linux, you're probably going to want to use C for that.However, since you're just generating keystrokes (not trying to intercept them, which I was trying to do years ago), you may be able to use whatever features the operating system has for sending artificial keystrokes. Windows has an interface for doing that (probably several, the one I'm thinking of is but I know there's some 'journal' interface that does something similar), and I'm sure other operating systems do as well. That may well be sufficient for your purposes — it's where I'd start, because the device driver route is going to be awkward and you'd probably have to use a different language for it than Java. (I'm a big fan of Java, but the interfaces that operating systems use to talk to device drivers tend to be more easily consumed via C and similar.)Update: More about the 'dictionary' of chords to keystrokes:Basically, the dictionary is a (thanks, @Adam) that we search with longest-prefix matching. Details:In machine stenography, the stenographer writes by pressing multiple keys on the stenotype machine at the same time, then releasing them all. They call this a 'stroke' of the keyboard; it's like playing a chord on the piano.

Strokes frequently (but not always) correspond to a syllable of spoken language. Like syllables, sometimes one stroke (chord) has meaning all on its own, other times it only has meaning combined with following strokes.

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(Think 'good' vs. 'good' followed by 'bye'). Although they'll be heavily influenced by the school at which they studied, each stenographer will have their own 'dictionary' of what strokes they use to mean what, a dictionary they will continuously hone over the course of their working lives. The dictionary will have entries where the stenographic part ('steno', for short) is one stroke long, or multiple strokes long. Frequently, there will be several entries with the same starting stroke which are differentiated by their length and by the subsequent strokes. For instance (and I won't use real steno here, just placeholders), there may be these entries: A = alphaA/B = alphabetA/B/C = alphabeticA/C = air conditioningB = beeB/C = becauseC = seaD = dogD/D = Dee Dee(Those letters aren't meant to be musical notes, just abstract markers.)Note that A starts multiple entries, and also note that how you translate a C stroke depends on whether you've previously seen an A, a B, or you're starting fresh.Also note that (although not shown in the very small sample above), there may be multiple ways to 'play' the same word or phrase, rather than just one. Stenographers do that to make it easier to flow from a preceding word to the next depending on hand position.

There's an obvious analogy to music there, and you could use that to make your typing flow more akin to playing music, in order to both prevent this from negatively affecting your piano playing and to maximize the likelihood of this actually helping with the RSI.When translating steno into standard text, again we use a 'longest-prefix match' search: The translation algorithm starts with the first stroke ever written, and looks for entries starting with that stroke. If there is only one entry, and it's one stroke long, then we can reliably say 'that's the entry to use', output the corresponding text, and then start fresh with the next stroke. But more likely, that stroke starts multiple entries of varying lengths.

@I: Some programs try to talk directly to the keyboard device and so don't play nicely with 'sendkeys'-like interfaces. Hopefully this is even less common now than some years ago when I last dealt with this, and so as I say, I'd start with 'sendkeys' like mechanisms and only worry about the other if and when you needed to. (Probably best to do a quick program testing sending keys on its own, not by receiving them from MIDI - including special key sequences - and then testing that with the software you want to control before you get too far down the path.)–May 8 '11 at 16:09. @FeepingCreature: When I was doing this with stenographers and court reporters, their dictionaries could readily run to the hundreds of thousands of entries (I remember one who broke the million mark). There was nothing remotely premature about using an optimizing strategy, we were dealing with 12 MHz 386s.

In I's case, if he goes with the Arduino idea (which is a really cool idea), he too will be dealing with fairly underpowered hardware for the modern era, though of course stuff ridiculously faster than what we had. I think his dictionary would tend to be dramatically smaller, but.–Jan 3 '12 at 9:50. I love the idea of using an Arduino for this.

Memory could be a problem, though. It looks like the largest pre-designed boards have 256k of Flash (of which 8k is used by the bootloader). Back in the day, we crammed realtime translation / display / editing of machine shorthand into 1M under DOS (e.g., the usual 640k plus either EMS or extended memory), but we were writing tight C code and assembly and the dictionary (which could easily be 250k on its own) was on disk.

Here there's be no display or simultaneous editing, so that's good, but the dictionary will have to be small.–May 15 '11 at 12:34. Oh, that's nothing.

I routinely dealt with court reporters who had dictionaries that, even stored in the very compact form we used, were multiple megabytes in size. The biggest I personally saw was 4.5MB - and again, that was stored in a highly-compressed form. Combine that with the fact that there are fewer keys on a steno keyboard than a piano keyboard. Still, though, the Arduino has a USB port, so the dictionary could be on a USB flash adapter, or even an (externally-powered) SSD or HDD.–May 22 '11 at 8:50.

It sounds to me like you're looking less for advice on how to build this yourself and more asking what resources are already out there to accomplish what you want. Depending on your OS, there are many ways to accomplish this without having to write your own program from scratch:Free.

For Mac OS X 10.3 and up. This one specifically comes with 'the ability to use any keyboard as a full blown computer keyboard replacement.' Free/Postcardware (it's a bit odd). For Windows 2000 and up, and Mac OS X. It initially appears to be more geared towards -type usage, but on further looking I think it could do what you want nicely.Free. For Mac OS X. Not exactly a 'ready out of the box' solution, but if you are comfortable with basic device configuration, it shouldn't be too bad.

I studied piano performance in college and then got into interaction design, programming, and using, so I have actually spent a lot of time prototyping things like this.You can get this working pretty quick in Linux by using the graphical programming language for multimedia artists, ',' along with the x11key external by.On Mac, you can use. I believe a method on Windows involved the and tools. At another time I had a version going using the Java plugin for. I believe made a windows external for Pure Data that worked as well, but I can't seem to locate it anymore.

Also, there's that can do this on Windows. Finally, the non-free but awesome can do what you want - see the features page.When I got it working, I never stuck with it, because I couldn't stop tooling with the layout. It was cool just having my monitor on my electric keyboard, though! About MIDIYou stated that you 'know nothing at all about MIDI'.

MIDI technology is fairly straight-forward once you grasp it, but it can be confusing at the outset. One of the resources that has been tremendously helpful for me in understanding the foundations for MIDI (which are certainly necessary if you want to program MIDI interactions), is a book called. It's an easy book to read and is very helpful.Pure Data & MaxIn my experience developing interactive multimedia, there are two very similar programs I have encountered that facilitate connecting and mapping signals/inputs from any device.These are for a Mac environment and for a PC environment. Both have a plethora of online documentation and YouTube tutorials. The video demonstrates a program built in Max that maps a computer keyboard to a MIDI keyboard's inputs (which is basically the exact opposite of what you are trying to do). You could get your intended results by using the same pattern, but reversing the signals/mappings.AutoHotKeyis a free open source utility for Windows that allows you to remap keys and buttons on your devices to macros.

It natively supports QWERTY keyboards, joysticks and mouse macros.However, I was able to find an implementation supporting the specific mapping you are looking for. These two threads explain the process:., the discussion of the use case. The author was looking for a program that could detect MIDI IN input and translate that to keypresses., the solution to the author's problem and the posted code/patch to AutoHotKey which actually implements your intended result.Basically, it looks like AutoHotKey, along with this user's custom patch, will provide exactly what you need to create a mapping from a MIDI keyboard to a QWERTY keyboard's input signal. All you would have to do is install, configure and define your mappings.Anything else?Some of the other answers have given you much more extensive information on MIDI and MIDI programming, in general, but as your post states that doesn't seem to be quite what you are looking for. I would like to help you more if possible, but it w.