Hello.
According to the manual :
https://s3.amazonaws.com/motu-www-data/manuals/avb/624_User_Guide.pdf
Page 45.
Do you run any optical device ? Or a outside clock device to sync with ?
The only «problems» i have with the MOTU 624 AVB with Gnu/Linux (Debian
8.7 and 9) are :
Got 1 Xrun per Hour, not matter what i do, even if i do nothing with the
computer.
If i change the Buffer size, sometimes called frames/period, the lower i
set it the more i get Xrun without doing nothing with the computer.
I guess it's a USB3 (never tested USB2) problem with either my
motherboard - not a new one - or Alsa....
Latency is not a problem for what i'm doing, as i also have with the
MOTU 624 AVB the routing grid that allow to have direct monitoring.
Other thing :
If i set the Sampling Rate in the MOTU 624 AVB's web interface, to
192000, all the «From Computer» (1 2 3 ...) disappear, thus no sound
from anything played from computer.
Never investigate further this point as i do not know why i would use
192000 sampling rate...
Cheers !
On 2017-12-21 05:01, georgnk wrote:
Hi guys, I think I found the cause of these tiny clicks.
Messing around with clock mode I discovered that changing the clock
mode
affects the rate of these clicks. Choosing ltc or optical mode then
back to
internal..They stop for a while and then start again.
If you have any ideas I 'd appreciate a lot.
Cheers
georgnk wrote
Hi.
Yes the firmware is v1.3.2+102 (520 is for the avb)
I don't know either what the bios menu is doing. I can only find bios
if I
press the select button from my interface and shows some info,nothing
more.
If you test it one day please let me know if you also have this
(minor)
issue.
Have nice holidays. Cheers!
list-2 wrote
Hello.
I am away from my computer with the MOTU 624 AVB for the holidays.
I'll
make a try when i'll be back.
But i've just checked the firmware pages of MOTU's web site and :
v1.3.2+520 (Release Date 2017-12-13)
A new one as been added few days ago. I've never tried this one.
Is the the firmware you running your card with ?
The change log says :
Added Bios menu
Hmm i'm really wonder what it does, and if it break anything with
Gnu/Linux Os.
Cheers !
On 2017-12-20 02:41, georgnk wrote:
Hello thank you for the reply.
The clicks are periodic.well,not strictly periodic but almost every
two
seconds. I have tried your suggestions but didn't change something.
What I have also discovered is that the clicks are not passing
through
my
software. Testing a sine wave and using a spectrum analysis in real
time,
sndpeek, clicks don't show up there. It seems they are coming
directly
to my
monitors (headphones)
Thanks a lot
Len Ovens wrote
On Mon, 18 Dec 2017, georgnk wrote:
I can also select my sound card without qjackctl and Jackd.
Pure data can see my input s and outputs directly. Then I go audio
test
play
the sine wave , wait a while, I move frequency up and down,clicks
start
and
never stop.
If these are random clicks, that sounds like sync issues. Some
things
to
try:
- set pulse default and alternate sample rate to 48000
- turn off HDA audio either in bios or in pulse:
pactl unload-module module-udev-detect
pactl unload-module module-alsa-card
(note that if pulse can see any audio card directly,
it may choose to sync from that one even if you are
not using it)
- try different sample rates, in particular both 44100 and
48000. It may be that alsa is under the impression
it can set sample rate when that is not the case.
I have not seen in this thread any meantion of the web interface
that
the
motu AVB series interfaces normally have, so I am guessing this is
not
one
of these boxes. Motu's support in the past with Linux has be
notoriously
bad until the AVB series, so you may have something that will not
work
with Linux properly... as in, it is USB2.0 compliant so far as
sound
transfer is concerned, but expects a provided blob to do device
setup.
The
AVB series uses a web based setup tool that is OS agnostic.
--
Len Ovens
www.ovenwerks.net
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