Yeah, like using (pitch) bending for (color) banding. 
…About keyboard shortcuts for darkroom modules, for me it works.
Awesome! How did I not see this??? I think this should help my fast paced processing environment. I think I could map the analog sticks vs the basic color correction modules. Thank you for this… 
…but harnessing the power of MIDI is a whole other level
Yes, If rightly done, It sure will take the mass post production to the next level.
(Food for thought - I do have an old Thrustmaster TMX Force Racing wheel. I think I can map the accelerator to the denoiser module and the brake to the Temperature module so that I can use both my forelimbs and hind limbs for photo processing ! 
)
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btw, in general I am always interested in ways to help move things along for the community in general. So if we decide it would be fun to buy a controller for the devs, then count me in (both management, setup, and monetary). As @paperdigits mentioned, color targets was one idea as well. I thought about buying a few and having them as rotating loaners in the community. Is that something folks might be interested in?
Heck, if everyone active here on discuss pitched in like $1 USD, we could buy that fancy palettegear pretty easy I’d think. But @houz would have to take a photo modeling it for us… (darnit! I was just totally going to post a funny photo of houz from the LGM photowalk in London, and now I see I didn’t get any!).
Funny pictures? Of me?
Well, ok. Here we go. Not the photo walk, but still LGM. Now you tell me who’s the model here …
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Touché you magnificent man! Now I’m gonna have to dig quickly for my riposte!
Well, my more serious answer would be, should someone try to collect money for such hardware I would suggest going for a regular MIDI device that is already supported by Linux. Adding support to darktable would be enough work already, reverse engineering USB protocols and writing a kernel driver would be too much work.
Do you have some recommendations? Would one of these KORG nano* be fine? I guess if every dt user [TM] would give $3, we could slightly pass the $50 and afford one of these ;-). Wait, I’ll do the math, it would be exactly $51 
Very good, you did your homework and know how many users we have. 
A quick google search indicates that the KORG nano* should work under Linux.
Yes I would definitely be up for it.
A suggestion, why doesn’t Pixls have a central ‘fund’ we can donate small amounts to, for things like this when they come up.
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After all the talk about a MIDI controller for darktable I think I will start building one myself with an Arduino. Sound like a fun little project.
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That’s where I already got some inspiration from for the thing I want to build. Of course it won’t be as flawless but the functionality might be similar. I already ordered some sample chips and will bug @andabata once I got stuck.
I bought a behringer bcf-2000 second hand for use with lightroom but hoping to be able to use it with dt some day
Short update: The first batch of parts to experiment with (Arduinos, rotary encoders, linear faders, buttons, LEDs, …) is ordered and about to be delivered soonish. I’ll keep you posted.
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And another update: The Arduino and the I2C GPIO chips are still not here. However, pixls managed to collect some money and BOUGHT A KORG NANOKONTROL2! How cool is that folks? The community managed to bribe me into writing Midi support for darktable! 
More news will follow once that thing is here (Amazon estimated Friday).
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Well shit, I haven’t even donated yet!
That’s why we didn’t get those fancy palettegear blocks.
Great news!
Is it possible to work in Kdenlive, Krita and GIMP with it then?
That would awsome. Especially in Kdenlive.
Palletgear was supposed to hook me up with a hardware api, but never did. I’d rather have generic midi support though 
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You’d need to take it up with the developers of each application. I’m not sure what I’d do with midi support gimp or krita, both have good wacom/tablet support, which I think is a better input device for those applications. But I wouldn’t want to use a wacom in Darktable, it doesn’t make a lot of sense!