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        MIDI-OX >> Mapping Questions >> Midi channel changes when i turn a knob?
        
(Message started by: dokbeat on Jan 17^th, 2008, 11:23am)

Title: Midi channel changes when i turn a knob?
Post by dokbeat on Jan 17^th, 2008, 11:23am

Ok, here is what i am trying to do:

I have mapped a knob from a nrpn with the min/max set to 1193 from channel 10 to event type ctrl 1 on channel 1 and the second min/max values set to 0-127 both places...

When i am trying to map a knob on my korg emx in ableton this happen:

at first it maps alright looking like this midichannel 1/controller 1,
but when i turn the knob the values suddenly changes to 10/6(channel 10/ controller number 6)?

This is driving me nuts! any hints on what i could have done wrong?

Cheers

Bjorn

Title: Re: Midi channel changes when i turn a knob?
Post by dokbeat on Jan 17^th, 2008, 11:30am

bassicly i looks like this when its mapped to 1/1

7686269 10 2 176 1 0 1 --- CC: Modulation

and when i start turning the knob it goes like this all the way up
to 127..

7766341 10 2 185 99 9 10 --- CC: NRPN MSB
7766341 10 2 185 98 41 10 --- CC: NRPN LSB
7766341 10 2 185 6 1 10 --- CC: Data Entry MSB

Title: Re: Midi channel changes when i turn a knob?
Post by dokbeat on Jan 17^th, 2008, 12:47pm

This is what my map looks like

http://i264.photobucket.com/albums/ii186/dokbeat/MAPPINGSETUP.jpg

Title: Re: Midi channel changes when i turn a knob?
Post by Jamie OConnell on Jan 20^th, 2008, 8:20pm

Yeah, NRPN's, when handled as NRPN's are treated somewhat differently than normal MIDI Messages. From the help file:

"When you choose NRPN as event type, the number and value fields have greater range than normal MIDI values. NRPN numbers and values are represented by 14 bit quantities: 0 - 16383 decimal. This is because 2 MIDI bytes (MSB and LSB) are used to formulate the number. When only MSB is transmitted, the magnitude of the value is similar (0 - 16256), but the granularity is not as fine."

Controller 6 (Data Entry) is the MSB of the CC:6 - CC:38 pair, so you need to map the whole range: 0 - 16256 (or 16383 if you're using CC:38) to 0 -127.

The other thing that looks weird in your picture is that subsequesnt mapping steps on the right are colored blue, which usually means that you've checked "[x] Use Input Value 1 (Pull)". That doesn't make any sense for NRPN's -- uncheck them.

Title: Re: Midi channel changes when i turn a knob?
Post by dokbeat on Jan 21^st, 2008, 3:36pm

you just saved my life!

well not really but i've been working with this for ages!
thamks Jamie!