Motormix pan knobs using Mackie MCU protocol

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  • Motormix pan knobs using Mackie MCU protocol
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I need help settip up My pan knobs on my Motormix. I have the faders working I am using Waveform 10 and the MCU protocol for my midi controller and I can’t seem to get the pan knobs to work but I see the incoming midi in the log from my DAW. So I tried to set the outgoing midi from the v-pots on the controller but it still not working. What am i doing wrong?

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Posted by (Q&A Forum: 2, Answers: 5)
March 9, 2019 7:26 pm
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Just a thought here……Are your pan knobs continuous? I’m not familiar with your MotorMix console. But, are your pan knobs sending 0-127, or just 0 and 127? (7F). I have Roland control surfaces with the continuous knobs, where they bang out 0 or 7F depending on if you rotated them left or right. So I had to create a global variable and increment or decrement it every time the pan knobs sent out a 0 or 127 (rotated left or right. And of course had to limit that to within 0..127).
( at March 9, 2019 9:35 pm)
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Hi, sorry, the tutorial video is not “exactly” what you need for this. This is a different type of relative encoder than shown in the video. I’ve included an example for VPOT 0 only below. In this case I used CC100 for output.

The variable g0 is used to hold the current CC value. If you duplicate this translator for another vpot, you will need to assign a different global variable for each CC value you want to track.

For this VPOT (0) incoming is B0 10 qq

For VPOT 1 incoming would be B0 11 qq

….

The first line of rules here is

uu=g0

for the second translator I would recommend you use g1 so it would be

uu=g1

and then at the end of rule instead of

g0=uu

you would put

g1=uu

Then of course modify the output for the controller you want.

 

Here are all of the rules for VPOT0  to CC100

// get global variable
uu=g0
// lets determine direction look for 0x40
rr=qq&64
// determine if positive of negative
if rr==0 then ss=1
if rr==64 then ss=-1
// Now lets thake the rest 0x3f
rr=qq&63
// mulitply by ss to set direction
rr=rr*ss
uu=uu+rr
// never less than 0
if uu<0 then uu=0
//never greater than 127
if uu>127 then uu=127
// put it back into global variable
g0=uu

 

 

 

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Posted by (Q&A Forum: 42, Answers: 3296)
March 10, 2019 6:50 pm
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So I watched the video and downloaded the project. Now I have the knobs responding in the Daw with midi latch but I can’t seem to get it to respond in the MCU protocol. Also as you will see in the video all the pan knobs are not responding correctly.

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Posted by (Q&A Forum: 2, Answers: 5)
March 10, 2019 5:37 pm
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Hi,

MCU Pan knobs (VPOTS) do not send absolute MIDI CC information.

The format of what they send is

B0 1i xx

Where i is the knob number 0-7

xx is an even more complex formula but in summary if it is 4x then it is a negative movement and if it is 0x then it is a positive movement.

The last x is the 4 least significant bits of the movement 0-15

There are actually 6 bits of movement, the other 2 bits are bit 2 and bit 1 of the first x

Here are some examples

B0 10 42  – VPOT 0 Counter clockwise 2 ticks

B0 10 03 – VPOT 0 Clockwise 3 ticks

B1 11 72  – VPOT 1 counter clockwise 50 ticks

B1 11 32 – VPOT 1 clockwise 50 ticks.

The last two examples are from the specification but I seldem if ever have seen a MIDI message number of ticks exceed 15.

So what you will have to do here if you want to convert to an absolute value is review our tutorial on turning a relative encoder to absolute and keep track of the position of the encoder in a global variable.

Are you planning on using this information to move an actual knob/fader or update an LED ring?

Steve Caldwell
Bome Q and A Moderator and
Independent Bome Consultant/Specialist
bome@sniz.biz

 

 

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Posted by (Q&A Forum: 42, Answers: 3296)
March 10, 2019 12:40 am