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NRPN in the BCN44

2014-10-12 by Alex

Hi all,

I have been configuring the encoders of the BCN44 for sending 14-bit NRPN data to control some parameters in the Moog Sub 37 synthesizer but it didn't work. Then I decided to try it using a iOS app called TB MIDI Stuff and it worked flawlessly. I checked the date sent from the 2 devices in MIDI-OX and I could see that was different. I thought the NRPN were standard.

NRPN from BCN44:

CC99 (NRPN MSB) value 03
CC98 (NRPN LSB) value 59
CC06 (data MSB) value 1
CC38 (data LSB) value 0 = EG Times, 1 = Filt Res, etc.

NRPN from TB MIDI Stuff:

CC99 (NRPN MSB) value 03
CC98 (NRPN LSB) value 59
CC06 (data MSB) value 0
CC38 (data LSB) value 0 = EG Times, 1 = Filt Res, etc.

Somebody knows why the CC06 is 1 in the BCN44 and 0 in the other.

Could I "fix" that in the BCN44 for sending CC06 value 0 in the NRPN?

Thanks a lot in advance specially to Mark for developing BCN44 Manager software.

Alex

Re: NRPN in the BCN44

2014-10-21 by markwinvdb@...

Hi Alex,

Sorry for not responding sooner, but I don't visit this forum as regularly as I used to,
since I set up a BC2000/BCN44 forum at my own website (mountainutilities.eu) about a year ago.

Concerning your question: my BCN44 exhibits the same behavior you noticed.

For encoders using the "Absolute 14-bit" NRPN range, the BCN44 outputs the wrong data value for certain Data MSB messages, as follows:

Display => SentMSB SentLSB

0 => 1(should be 0) 0
127 => 1(should be 0) 127

128 => 1(correct) 0
255 => 1(correct) 127

256 => 3(should be 2) 0
383 => 3(should be 2) 127

384 => 3(correct) 0
511 => 3(correct) 127

512 => 5(should be 4) 0
639 => 5(should be 4) 127

640 => 5(correct) 0

So the BCN wrongly adds 1 to any EVEN Data MSB value.

So unless I'm much mistaken, the BCN44's firmware contains a weird bug concerning "Absolute 14-bit" NRPN messages, and there's nothing we can do about it.
By the way, my BCN44 has firmware version 1.02, as indicated in the display after power-on; I assume that yours is the same?

Mark.

Re: [bc2000] Re: NRPN in the BCN44

2014-10-21 by Alex

Hi Mark,

Thank you for your help. Mine has 1.02 firmware too. It's a pity this product has been discontinued because we'll never see the 1.03 update :(

Best wishes.

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2014-10-21 18:01 GMT+02:00 markwinvdb@... [bc2000] <bc2000@yahoogroups.com>:

Hi Alex,

Sorry for not responding sooner, but I don't visit this forum as regularly as I used to,
since I set up a BC2000/BCN44 forum at my own website (mountainutilities.eu) about a year ago.

Concerning your question: my BCN44 exhibits the same behavior you noticed.

For encoders using the "Absolute 14-bit" NRPN range, the BCN44 outputs the wrong data value for certain Data MSB messages, as follows:

Display => SentMSB SentLSB

0 => 1(should be 0) 0
127 => 1(should be 0) 127

128 => 1(correct) 0
255 => 1(correct) 127

256 => 3(should be 2) 0
383 => 3(should be 2) 127

384 => 3(correct) 0
511 => 3(correct) 127

512 => 5(should be 4) 0
639 => 5(should be 4) 127

640 => 5(correct) 0

So the BCN wrongly adds 1 to any EVEN Data MSB value.

So unless I'm much mistaken, the BCN44's firmware contains a weird bug concerning "Absolute 14-bit" NRPN messages, and there's nothing we can do about it.
By the way, my BCN44 has firmware version 1.02, as indicated in the display after power-on; I assume that yours is the same?

Mark.

Bc2000 (for the BCF2000 & BCR2000)

NRPN in the BCN44

NRPN in the BCN44

Re: NRPN in the BCN44

Re: [bc2000] Re: NRPN in the BCN44

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