Re: connect two midi devices

Sent from my iPhone

> On 26. May 2018, at 11:12, Alexandre Ratchov <alex@caoua.org> wrote:
>
>> On Sat, May 26, 2018 at 12:10:03AM +0200, Sebastian Reitenbach wrote:
>> Am Freitag, Mai 25, 2018 22:22 CEST, Alexandre Ratchov <alex@caoua.org> schrieb:
>>
>>> On Fri, May 25, 2018 at 10:22:26AM +0200, Sebastian Reitenbach wrote:
>>>> Hi Alexandre,
>>>>
>>>> Am Freitag, Mai 25, 2018 08:41 CEST, Alexandre Ratchov <alex@caoua.org> schrieb:
>>>>
>>>>> On Fri, May 25, 2018 at 12:21:18AM +0200, Alexandre Ratchov wrote:
>>>>>>
>>>>>> Maybe, but unlikely. If the device attaches, generally it works. Show
>>>>>> what's received on midi2 when you type on the keyboard or do any other
>>>>>> simple actions.
>>>>>>
>>>>>
>>>>> fwiw, here's a small utility that I use very often to debug & connect
>>>>> MIDI ports.
>>>>>
>>>>> http://caoua.org/alex/obsd/midicat.tar.gz
>>>>>
>>>>> To connect two rmidi/2 -> rmidi/1 and dump the data on stderr, run:
>>>>>
>>>>> midicat -d -q rmidi/2 -q rmidi/1
>>>>
>>>> Actually, that midicat seems to do the trick. When I run it in debug, and press some keys on the
>>>> system-1, output looks like:
>>>>
>>>> f8
>>>> f8
>>>> fe
>>>> f8
>>>> f8
>>>> f8
>>>> 90 80 9b
>>>
>>> ^^^^^^^^^^^
>>>
>>> these 3 bytes make no sense. The status byte 0x90 is correct but the
>>> two args are wrong. This is when you pressed the key, right?
>>>
>>>> ...
>>>> 90 9b b2
>>>
>>> These are also wrong, and this is when you released the key, right?
>>> Interestingly the 0x9b is repeated.
>>>
>>
>> f8
>> f8
>> f8
>> 90 80 34
>> 90 40 f8
>> ^^^^ released key
>
> This one is cleary wrong. 0x90 must be followed by two numbers in the
> 0..0x7f range.
>
>>>
>>> Clearly, the midi events are corrupted by the usb interface. Does the
>>> midi interface claim to be "class compliant"? does it come with
>>> drivers for MacOS or Windows?
>>
>> It was advertized as class compliant, and it just came the cable, no drivers.
>> But as I said, it was el-chepo from ebay not even 3 EUR incl. shipping from China.
>>
>
> do you know if it works on other operating systems?

Don't know, I need to dig out an unused notebook and install some Linux on it.

Sebastian