[alsa-devel] Audiophile Delta 24/96 Midi Out continuously sends zeroes (alsa 1.0.14)

Romain Bossart romain.bossart at free.fr
Wed Sep 19 06:59:29 CEST 2007

Hi all, Hi Clemens,

just for your information, the midi out was broken.
I grabbed a bought an old layla and everything works now.

Thank you again for your help.


Romain Bossart wrote:
> Clemens Ladisch wrote:
>> Romain Bossart wrote:
>>> Selon Clemens Ladisch <cladisch at fastmail.net>:
>>>> That is, the zeroes are _not_ sent when you're not using jack?  When
>>>> nothing is connected, or when you use aplaymidi or amidi to send
>>>> something, everything is OK?
>>> Here is a summary of the various tests I did. I have just one card: Audiophile
>>> Delta 24/96. My kernel is now RT patched & alsa 1.0.14,
>>> Audio works perfectly. I don't think jack is the problem.
>>> Config #2 = Delta Midi Out -> (Midi In) Instrument (Midi Out/Thru) -> Delta Midi
>>> In and 'amidi -p hw:0,0 -d'. Jack being started or not.
>>> Symptoms: tons of zeroes are shown by amidi as soon as I launch it. The stream
>>> is so intense I can actually hear it in my speakers/monitors (need to switch to
>>> better MIDI cables, I know!). amidi and /proc/asound/card0/midi0 give the same number
>>> of transmitted bytes.
>> With "transmitted", you meant "received"?
>> When Jack is not running, there is no software to send anything.  If the number
>> of _transmitted_ bytes changes anyway, this would be a bug in ALSA.
> Oops, 'reveived' is correct. Thank you.
>>> Config #2b = Delta Midi Out -> Delta Midi In
>>> and 'amidi -p hw:0,0 -d', Jack being started or not.
>>> Symptoms: identical to config#2. Moreover, if meanwhile I send some Midi commands
>>> with amidi ('amidi -p hw:0,0 -S C01C'), I don't find this data in my dump.
>> Apparently, the output port is broken.  While it is theoretically
>> possible that the driver doesn't initialize the card correctly, I cannot
>> imagine a bug that would cause the port to presume that there is data to
>> send.
> You're right the output port seems to be broken.
>> Could you test if the port sends data even before the driver (or Linux)
>> is loaded, or in Windows?
> I am not sure I can try this. I will change my card.
>> Regards,
>> Clemens
> Thank you very much for your help.
> Regards,
> Romain

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