9 Jun
2004
9 Jun
'04
5:25 p.m.
Anyone using this device with jack?
and Ardour?
Thanks
--
Tim Gorman
Information Systems Specialist
Petr-All Petroleum Corp.
office (315) 446-0125 x126
cell (315) 415-8108
9 Jun
9 Jun
5:53 p.m.
Timothy Alan Gorman wrote:
Anyone using this device with jack?
and Ardour?
Thanks
You can reliably use it for playback but only with two channels. It
works with 4 channels and alsa native programs like ecasound or arecord.
The main problem turns out that it can only record in big endian format
but plays back in little endian format. This means someone has to write
a layer for alsa which automatically converts big endian to little
endian when the quattro is in use. Pretty annoying and lame. Until this
is done all recordings will sound noisy due to rounding errors or some
other bs.
If I count the design "errors" that maudio made with this device I think
there are 5.
1: Two clock synced stereo channel boards instead of one 4 channel board.
2: Only able to run reliably with lowish latency (480 bits) at 48000hz
(applicable to all usb devices though).
3: Input only reads big endian format.
4: Output only accepts little endian format.
5: Cannot recieve power from the usb port. Requires external adapter.
If you want to buy a good multichannel device for portable recording you
can find better and more user friendly designs in the firewire range
these days.
If you can wait for a few months RME will release their next gen which
should be completely firewire compatible....
--
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
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Http://www.djcj.org/gigs/ - Gigs guide Korea
Http://www.nana7.net - Bar Nana - Itaewon, Seoul, Sth Corea
========================================
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discipline and panicked, toppling the cart. At that point, the rockets
disconnected from the timer, leaving them strewn around the street.
Tethered to the now toppled cart, the donkey was unable to escape before
the arrival of U.S. troops.
United Press International
Rockets on donkeys hit major Baghdad sites
By P. MITCHELL PROTHERO
Published 11/21/2003 11:13 AM
6:07 p.m.
Patrick Shirkey wrote:
Timothy Alan Gorman wrote:
Hmmm,
Not so good eh' ?
so the 'record 4 tracks' function will not work without output (hardware
monitoring?) at
the same audio format?
can I just "record" with 4 tracks?
I have used logic in the past but have been followung the development of
jackd and ardour for a LONG time....I am vested in the piece of audio
equipment (maudio quattro)....I guess I couild sell it...I would only
get a nickel though... I really wanted to user ardour to remaster my old
4 tracks...
--
Tim Gorman
Information Systems Specialist
Petr-All Petroleum Corp.
office (315) 446-0125 x126
cell (315) 415-8108
Anyone using this device with jack?
and Ardour?
Thanks
You can reliably use it for playback but only with two channels. It
works with 4 channels and alsa native programs like ecasound or arecord.
The main problem turns out that it can only record in big endian
format but plays back in little endian format. This means someone has
to write a layer for alsa which automatically converts big endian to
little endian when the quattro is in use. Pretty annoying and lame.
Until this is done all recordings will sound noisy due to rounding
errors or some other bs.
If I count the design "errors" that maudio made with this device I
think there are 5.
1: Two clock synced stereo channel boards instead of one 4 channel board.
2: Only able to run reliably with lowish latency (480 bits) at 48000hz
(applicable to all usb devices though).
3: Input only reads big endian format.
4: Output only accepts little endian format.
5: Cannot recieve power from the usb port. Requires external adapter.
If you want to buy a good multichannel device for portable recording
you can find better and more user friendly designs in the firewire
range these days.
If you can wait for a few months RME will release their next gen which
should be completely firewire compatible....
10 Jun
10 Jun
2:13 p.m.
hi all,
maybe a bit of topic, but does the bandwidth limitation of the usb bus
apply only to a single device or does it apply for all devices on the
bus...
or to be concrete: is it possible to record 4 channels with a quattro to
a usb hard drive?
cheers...
--
Tim mailto:TimBlechmann@gmx.de
ICQ: 96771783
--
The only people for me are the mad ones, the ones who are mad to live,
mad to talk, mad to be saved, desirous of everything at the same time,
the ones who never yawn or say a commonplace thing, but burn, burn,
burn, like fabulous yellow roman candles exploding like spiders across
the stars and in the middle you see the blue centerlight pop and
everybody goes "Awww!"
Jack Kerouac
2:33 p.m.
Hi!
If the hard drive and the Quattro are on the same bus (usb controller),
I don't think there is any chance of getting that working. But, your
computer probably has more than one usb bus. If the devices are
connected to different busses, then it should work fine if the driver
isn't crap. I haven't tried this, so I cannot confirm this though.
At least on my motherboard, the usb plugs for the front panel are
connected to one bus, and the ones in the back are connected to another
one.
Sampo
On Thu, 2004-06-10 at 19:59, Tim Blechmann wrote:
hi all,
maybe a bit of topic, but does the bandwidth limitation of the usb bus
apply only to a single device or does it apply for all devices on the
bus...
or to be concrete: is it possible to record 4 channels with a quattro to
a usb hard drive?
cheers...
5:09 p.m.
New subject: USB buses [was: Re: [linux-audio-user] maudio quattro...]
Hallo,
Sampo Savolainen hat gesagt: // Sampo Savolainen wrote:
If the hard drive and the Quattro are on the same bus
(usb controller),
I don't think there is any chance of getting that working. But, your
computer probably has more than one usb bus. If the devices are
connected to different busses, then it should work fine if the driver
isn't crap. I haven't tried this, so I cannot confirm this though.
At least on my motherboard, the usb plugs for the front panel are
connected to one bus, and the ones in the back are connected to another
one.
Is there a way to find out how many buses there with things like
lsusb? Or being concrete again: Does this output mean, that I have two
busses, that should be able to provide the double bandwidth?
$ /usr/sbin/lsusb
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 002: ID 0547:1002 Anchor Chips, Inc.
Bus 001 Device 001: ID 0000:0000
This would be interesting as I might consider using some data
intensive devices on one bus while the other is taken by the
soundcard.
Ciao
--
Frank Barknecht _ ______footils.org__
6:49 p.m.
New subject: USB buses [was: Re: [linux-audio-user] maudio quattro...]
Hi,
It does look like that you have two busses. Actually root hub would be a
more exact term.
I guess you understand this, but for general education:
- Soundcards need to stream small bits of data ALL THE TIME
- Hard drives burst (comparatively) HUGE chunks once in a while.
This kind of operation does not mix well (=at all), when the streaming
data has to received on time and with low latency.
This incompatibility has nothing to do with bandwidth, it's a limitation
of serial interfaces. It's not about doubling your bandwidth, it's about
having two independent communication channels.
After sounding like I know about this stuff, here is something I don't
understand:
- I have four usb controllers visible with lspci.
3 UHCI (USB1.1) and 1 EHCI (USB2) controllers.
- cat /proc/interrupts shows that there are three usb-uhci modules
and one ehci module, each module using a different IRQ.
- With lsusb -v I see that 3 root hubs are "USB UHCI Root Hub" and one
is "Intel Corp. 82801DB USB2".
This looks like all USB2 devices are connected to this hub. That means
that there is a strong possibility that at least in my systems, all USB2
devices would share the same hub, regardless of which usb jack the
device is plugged into. I do not know how this works out in the driver
level, but it looks quite suspicious.
Does anyone have better knowledge about this? Could you enlighten us?
Sampo
On Thu, 2004-06-10 at 22:00, Frank Barknecht wrote:
Is there a way to find out how many buses there with
things like
lsusb? Or being concrete again: Does this output mean, that I have two
busses, that should be able to provide the double bandwidth?
$ /usr/sbin/lsusb
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 002: ID 0547:1002 Anchor Chips, Inc.
Bus 001 Device 001: ID 0000:0000
This would be interesting as I might consider using some data
intensive devices on one bus while the other is taken by the
soundcard.
Ciao
7563
days inactive
7564
days old
linux-audio-user@lists.linuxaudio.org
7 comments
5 participants
participants (5)
-
Frank Barknecht -
Patrick Shirkey -
Sampo Savolainen -
Tim Blechmann -
Timothy Alan Gorman