M-Audio Midisport 2x2 Anniversary edition, latency problem

M-Audio Midisport 2x2 Anniversary edition, latency problem

[Ilya Dikariev]

Hi all,

I bought a MIDI-interface von M-Audio (see subject), but there are strange things with it on my desktop (Arch, latest kernel). The latency is about 5 seconds. If I reconnect cabels, the latency can change from 5 sec to 0.5 sec, or to ~0sec, but in 90% of all the tries, the latency stay at 3-5 sec.

I tried it on my older laptop (kernel 2.6.32 from Ubuntu 10.04) and it works! I think it's a regression. How can I help to fix this bug?

best regards,
Ilya.

Re: M-Audio Midisport 2x2 Anniversary edition, latency problem

[Clemens Ladisch]

Ilya Dikariev wrote:
> I bought a MIDI-interface von M-Audio (see subject), but there are
> strange things with it on my desktop (Arch, latest kernel). The
> latency is about 5 seconds.

How are you measuring the latency?


Regards,
Clemens

Re: M-Audio Midisport 2x2 Anniversary edition, latency problem

[Clemens Ladisch]

Ilya Dikariev wrote:
> Вторник, 28 апреля 2015, 15:30 +02:00 от Clemens Ladisch <clemens@ladisch.de>:
>> Ilya Dikariev wrote:
>>> I bought a MIDI-interface von M-Audio (see subject), but there are
>>> strange things with it on my desktop (Arch, latest kernel). The
>>> latency is about 5 seconds.
>>
>> How are you measuring the latency?
>
> I measured it only with my feeling of time.

What are the specific events between which there is an interval of
5 seconds?


Regards,
Clemens
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Re: M-Audio Midisport 2x2 Anniversary edition, latency problem

[Clemens Ladisch]

Ilya Dikariev wrote:
>>>>> I bought a MIDI-interface von M-Audio (see subject), but there are
>>>>> strange things with it on my desktop (Arch, latest kernel). The
>>>>> latency is about 5 seconds.
>>>>
>>>> How are you measuring the latency?
>>>
>>> I measured it only with my feeling of time.
>>
>> What are the specific events between which there is an interval of
>> 5 seconds?
>
> Between I press any key on a MIDI-keyboard and I hear the sound from
> the timidity-daemon (or any other MIDI-reciever in a computer).

There are lots of components involved besides the USB/MIDI interface:
Timidity, any sound server (if you're using one), and the sound card's
drivers.

It is extremely unlikely that the USB/MIDI interface could introduce
latency, because the only way to do that would be to go to the extra
effort of storing the MIDI events in some buffer, and then transmitting
them later.

> the MIDI events from the Pitch-wheel on the keyboard arrives the MIDI-
> reciever immedietly (I saw it, when i tried to check out the output
> from the /dev/midi).

This proves that another component introduces the latency.

(Note: you could also use amidi or aseqdump to do these tests.)


How did you configure the audio output of Timidity?


Regards,
Clemens

Re: M-Audio Midisport 2x2 Anniversary edition, latency problem

[Olivier]

Hello

I think I have similar problem on Debian 8 Jessie, M-Audio Midisport 2x2
Anniversary edition and a synth keyboard. In my case the midi works fine for
a moment but after a moment, the latency is about 5 seconds. GMidi monitor
linked to Jack monitors note events 5 seconds later... I have to plug again
the USB cable to make it work normaly. Did you find an issue to  that?

Olivier

Re: M-Audio Midisport 2x2 Anniversary edition, latency problem

[Clemens Ladisch]

Olivier wrote:
> I think I have similar problem on Debian 8 Jessie, M-Audio Midisport 2x2
> Anniversary edition and a synth keyboard. In my case the midi works fine for
> a moment but after a moment, the latency is about 5 seconds. GMidi monitor
> linked to Jack monitors note events 5 seconds later...

Do you get the same delay when monitoring with amidi or aseqdump?


Regards,
Clemens