[LAU] Inquiry regarding midi-filters

Benoît Rouits brouits at free.fr
Thu Aug 26 20:37:05 UTC 2010

Le jeudi 26 août 2010 à 21:23 +0200, Arnold Krille a écrit :
> Hi all,
> I do have a question for all the midi-freaks:
> I have a korg nanokontrol and would like to use it to control a mixer 
> (behringer ddx, not my own). For faders this works quite well, for the mute-
> buttons I am stumped:
> The ddx wants ctrl 104 with the channel as value to mute and ctrl 105 with the 
> channel to unmute.
> The nanokontrol can only send one controller with two different values per 
> button.
> So I thought about making the nanokontrol send the channel as controller and 
> 104 as value for mute 105 for unmute. And then use a midifilter to switch ctrl-
> number and value before sending it to the ddx.
> And this is where the fun begins.
> midish is not able to do that (at least I couldn't make it work during one 
> evening).
> qmidiroute is not able to do that (at least I couldn't make it work during one 
> evening).
> puredata is not able to do this. While it is easy to connect ctlin with ctlout 
> and switch ctrl and value, it sometimes uses the value from the event before 
> and I couldn't get that to work either... (If some pd crack can give me a 
> hint, I am very open to that, the problem seems to be that the events are 
> passed/handled in the wrong order.)
> Is there any other easy midi-router / -filter that even thinks about these use 
> cases? (Note: I didn't yet try pidim...)
> Thanks for your answers,
> Arnold

If the matter is to swap a controller parameter with its value,
i can luckily code that now. Would the process be:

if (event_type == CONTROLLER) {
 if (event_channel == channel_to_work_on) {
  if (event_param == controller_to_work_on) {
   swap = event_value;
   event_value = event_param;
   event_param = swap;

- Benoît

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