[chbot] MIDI over USB for nanoKONTROL2 control surface

[Mark Atherton]

Hi Dave,

Finally managed to work through all of your comments in detail and I 
think you may be correct.

Fetching current scene, saving as file1, moving slider, fetching 
current scene, saving as file2 then comparing file1 vs file2 did not 
result in any differences.

Is it me, or is SYSEX really badly documented ? - this has all been 
quite painful.

Quite disappointed that something so simple as control surface 
slider/knob read is missing.

Anyway, the video you reference does offer a reasonable solution. You 
certainly don't want to move a fader that was at -60dB suddenly up 
to-10 just because that is the new position due to a context switch 
of the control surface. That was the dilemma I was faced with.

Thanks for your help.

Mark


At 09:11 p.m. 1/04/2013, you wrote:
>Hi Mark,
>
>You can get some information back by sending it MIDI sysex messages, 
>but it looks like it will only dump the current scene configuration, 
>which isn't (as I understand it) the current position of the 
>sliders. The MIDI implementation doc is here: 
>http://www.korg.co.uk/support/downloads/nano_dl.php in 
>nano_MIDI_implementation.zip, and there is some Python code for 
>sending and reading scenes using sysex on 
>https://github.com/royvegard/Nano-Basket/blob/master/nano_basket_backend.py
>
>If the Korg editor software can read the current position of the 
>sliders then there's a chance that there's an undocumented message 
>that will do it, otherwise I don't think it's possible. In software 
>you can either just jump the controlled parameter to the fader 
>position as soon as someone moves it, or wait until they move the 
>fader to the current parameter position before changing the 
>parameter, as in this video:
>http://youtu.be/PgRTyMnosSI?t=1m54s
>
>Dave
>
>On 01/04/2013 14:39, Mark Atherton wrote:
>>Hi All,
>>
>>Hopefully someone here can save me some work digging around for a 
>>solution to this question:
>>
>>I am building a small wireless interface for a KORG nanoKONTROL2 
>>MIDI-over-USB control surface. The system is based on a Microchip 
>>dsPIC device with USB host port, so far so good; everything works 
>>as expected in terms of controlling LEDs on the control surface, 
>>and reading back sliders, knobs etc. as Control Change messages.
>>
>>As an example, after moving a slider, a message is received like 
>>0x0B, 0xB0, 0x02, 0x78 -- Cable 0, Control Change, Address 2, Data 0x78, etc.
>>
>>I need to be able to read the whole control surface at power up, so 
>>for example I need to know how to interrogate slider 2, to find 
>>it's current position without moving it.
>>
>>Any ideas how I go about doing this will be appreciated, or a more 
>>appropriate forum.
>>
>>Thanks,
>>
>>Mark
>
>
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