Volume faders jumping erratically when BSP is playing

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adfa
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Volume faders jumping erratically when BSP is playing

Post by adfa » Tue Sep 20, 2016 2:11 pm

Hi,
I have MCU enable in MMC.
I have MCU enabled in Auria Pro.
Entered control mode/MCU on BSP
On BSP, knobs 1-8 pan nicely on Auria. Knobs 9-16 move the Auria volume faders but it first seems to register a 0 as on first movement of the knob, Auria fader will jump to 0.
If I then hit play on BSP and move the volume fader knobs, the graphical fader on Auria goes mental. The fader keeps jumping to 0. For every turn I make of the knob, the graphical fader will jump back to 0. This makes for a very jittery affair as Auria's fader is jumping from the new value sent by BSP knob turning back to 0 many times a second.
I wonder if this is a bug or are there some settings that need to be adjusted?
The pan knobs work fine.

From Midivision:-
On BSP in control/MCU mode the faders are sending out pitchbend data with values from 0 to 16368 from their respective midi channels.
There's also a constant stream of cc's. Not sure where they are from. The cc number changes every so often.
I would imagine it is this background data that is zeroing the faders.
BSP doesn't seem to respond in HUI mode at all.
Running ios9 on iPad pro 9.7 with apogee duet USB to BSP
Any assistance would be greatly appreciated.
Thank you..

adfa
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Re: Volume faders jumping erratically when BSP is playing

Post by adfa » Thu Sep 22, 2016 11:10 pm

@rim
Can you help me with is?

Corey W
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Re: Volume faders jumping erratically when BSP is playing

Post by Corey W » Sat Sep 24, 2016 7:17 am

We don't have a BeatStep Pro on hand to test your findings, but I have contacted the engineer I know at Arturia to see if he can do some testing for me and figure out what may be going on.

If anyone else on the forum has a BSP and wants to jump in on this, feel free.

I'll try and get you some info ASAP.

-Corey

Radside
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Re: Volume faders jumping erratically when BSP is playing

Post by Radside » Sat Sep 24, 2016 12:12 pm

I used to get similar behavior with the faders jumping to zero on my X touch before they fixed the MCU mode in Auria. Do you have the latest version of Auria installed.

adfa
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Re: Volume faders jumping erratically when BSP is playing

Post by adfa » Sun Sep 25, 2016 1:34 am

Excellent. Thank you very much.
I have only just bought Auria a week ago so it must be the latest version. I have updated BSP fw and sw.

adfa
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Re: Volume faders jumping erratically when BSP is playing

Post by adfa » Sun Sep 25, 2016 1:36 am

To get BSP and Auria talking properly would be a dream. It's the only app I can find that supports mcu from the BSP

adfa
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Re: Volume faders jumping erratically when BSP is playing

Post by adfa » Sun Sep 25, 2016 1:38 am

In the meantime. I will see if I can just filter out the pitch bend data as a workaround.
Would prefer to use BSP as the master clock but that will have to wait.

adfa
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Re: Volume faders jumping erratically when BSP is playing

Post by adfa » Sun Sep 25, 2016 2:07 am

MCU/HUI protocol has faders 1-8 assigned to the pitch wheel. This looks like those fader protocols are being sent by pots 9-16. Is this the correct implementation? How can I change it?

adfa
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Re: Volume faders jumping erratically when BSP is playing

Post by adfa » Mon Sep 26, 2016 6:54 am

So. BSP internal clock. Play button enabled.
Midiflow monitor. First half of the monitor, before the modifier button has a string of clock data,
"off c-1 000", "on c#2 080" "on c#2 127" and "off c#2 064"
But.
Without any modifier. I.e. no change.
Second half of the monitor replicates all the c#2 data and clock x24. Nothing else. No "off c-1 000".

1. Can anyone tell me what data this is? The only thing coming from the BSP is "play".

2. How come the missing c1 data in the 2nd half of Midiflow?

wigglelights
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Re: Volume faders jumping erratically when BSP is playing

Post by wigglelights » Wed Sep 28, 2016 11:55 am

I may be totally wrong but -
I believe mcu and hui are sysex formats, and I don't think midiflow reads sysex. The data you are seeing is probably midiflow's best guess at what it's seeing.
I think you are on the right track though in trying to analyze the issue tho. Do you have a win or OS X machine you could run a more full featured monitor on?

adfa
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Re: Volume faders jumping erratically when BSP is playing

Post by adfa » Wed Sep 28, 2016 11:03 pm

i saw somewhere else that the MCU protocol does indeed have LSB and MSB pitch bend for the faders (pots 9-16 on the BSP). So this would seem to be correct. Midiflow reads from -8192 to +8191 which would correlate with the 14 bits that are given by 2 combined CC's (LSB and MSB). I think this is the issue. if I can find a way to block pitch bend -8192 value from getting through, i can check this. It doesnt look like Midiflow can do this though, only reassigning that value. I need to filter it out.
My goodness this is getting complex. I will be programming midi routines after i am done with this!!

adfa
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Re: Volume faders jumping erratically when BSP is playing

Post by adfa » Fri Oct 07, 2016 12:19 am

So MCU protocol doesn't seem to use any sysex. It does use pitch bend for the volume faders as it makes use of the 14 bits for the resolution.
Rim:
How does Auria handle/filter those pitch bend messages?

adfa
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Re: Volume faders jumping erratically when BSP is playing

Post by adfa » Fri Oct 28, 2016 7:15 pm

Anyone know the answer?

Rim
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Re: Volume faders jumping erratically when BSP is playing

Post by Rim » Sat Oct 29, 2016 6:25 am

MCU is a proprietary protocol that uses custom messages back and forth. It only works with MCU compatible controllers. We signed an NDA with Mackie, so we can't really discuss any technical details about how it works.

Rim

adfa
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Re: Volume faders jumping erratically when BSP is playing

Post by adfa » Sat Oct 29, 2016 8:42 am

I understand. Does the nda also prevent you from discussing how auria interprets the messages though?
I really need a solution as either auria is not interpreting properly or the BSP is sending instructions it shouldn't

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