8 Nov
2010
8 Nov
'10
8:55 a.m.
A mythical beast, rumored to exist, but never actually seen. Others have tried, but
failed, to locate it. I now join the search. This beast is:
1) USB 1.0 "class compliant"-- NOT USB 2.0 -- and thus works with Linux
2) Is well and truly supported by ALSA.
3) Has FOUR outputs and 2-4 inputs, all usable from within JACK, with good professional
quality DAC/ADCs.
4) The outputs and inputs are balanced and applicable for low or high impedance (probably
with a switch), and have TRS 1/4" jacks or XLR or both.
5) Does not cost an arm and a leg.
This does not mean the FastTrack Pro! Sure it SAYS it has 4 channels, but only two are
accessible from JACK. I have one and have used it for years, but I now need more outputs.
And, also, the output of the "other" 4 channels is just RCAs. I need 4 channels
output, USB1.0, 44.1Khz/24bit. I could use a cheap 5:1 home-theater USB fob type
interface, but the sound quality would probably suck, and it sure won't give me
balanced outs.
Does this Unicorn exist? Anyone seen one?
-ken
8 Nov
8 Nov
10:11 a.m.
Ken Restivo wrote:
1) USB 1.0 "class compliant"-- NOT USB 2.0
-- and thus works with Linux
This is usually (technically correctly) advertised as "USB 2.0 full
speed".
3) Has FOUR outputs and 2-4 inputs, all usable from
within JACK, with
good professional quality DAC/ADCs.
This would mean full duplex and 24-bit samples, which would exceed the
bandwidth available for full speed devices.
Regards,
Clemens
6:05 p.m.
On Mon, Nov 08, 2010 at 10:13:04AM +0100, Clemens Ladisch wrote:
Ken Restivo wrote:
That seems odd, since there seem to be a lot of very cheap USB 1.0 devices that can
support 6 channels (5:1 surround for home theater).
I could live with a mode of 4 output channels 44.1k/16 and no input channels. But what I
need is good quality DAC and balanced outs.
-ken
1) USB 1.0 "class compliant"-- NOT USB
2.0 -- and thus works with Linux
This is usually (technically correctly) advertised as "USB 2.0 full
speed".
3) Has FOUR outputs and 2-4 inputs, all usable
from within JACK, with
good professional quality DAC/ADCs.
This would mean full duplex and 24-bit samples, which would exceed the
bandwidth available for full speed devices.
9 Nov
9 Nov
8:47 a.m.
Ken Restivo wrote:
On Mon, Nov 08, 2010 at 10:13:04AM +0100, Clemens
Ladisch wrote:
Full speed has just barely enough bandwidth for eight channels of 16-bit
samples at 48 kHz. This could be 7.1 output, or 6 outputs + stereo
input, or 4+4 outputs/inputs.
With 24-bit samples at 48 kHz, there's bandwidth for five channels
overall, i.e., 4 output channels, or full-duplex stereo.
With 24-bit samples at 96 kHz, there's bandwidth for two channels,
i.e., stereo output _or_ stereo input.
Regards,
Clemens
Ken Restivo wrote:
That seems odd, since there seem to be a lot of very cheap USB 1.0
devices that can support 6 channels (5:1 surround for home theater). 3) Has FOUR outputs and 2-4 inputs, all usable
from within JACK, with
good professional quality DAC/ADCs.
This would mean full duplex and 24-bit samples, which would exceed the
bandwidth available for full speed devices. 
8 Nov
8 Nov
12:21 p.m.
Ken Restivo wrote:
A mythical beast, rumored to exist, but never actually
seen. Others have tried, but failed, to locate it. I now join the search. This beast is:
1) USB 1.0 "class compliant"-- NOT USB 2.0 -- and thus works with Linux
2) Is well and truly supported by ALSA.
3) Has FOUR outputs and 2-4 inputs, all usable from within JACK, with good professional
quality DAC/ADCs.
4) The outputs and inputs are balanced and applicable for low or high impedance (probably
with a switch), and have TRS 1/4" jacks or XLR or both.
5) Does not cost an arm and a leg.
This does not mean the FastTrack Pro! Sure it SAYS it has 4 channels, but only two are
accessible from JACK. I have one and have used it for years, but I now need more outputs.
And, also, the output of the "other" 4 channels is just RCAs. I need 4 channels
output, USB1.0, 44.1Khz/24bit. I could use a cheap 5:1 home-theater USB fob type
interface, but the sound quality would probably suck, and it sure won't give me
balanced outs.
Does this Unicorn exist? Anyone seen one?
The Maya USB 44 comes close to your specs: It has 4 in 4 out, running at
44.1 or 48 kHz with 18 or 19 bits per sample (in and out differ a bit,
but both is more then 16 bit). Completely bus powered, works well with
ALSA/Jack.
See for example http://www.thomann.de/gb/esi_maya_44_usb.htm
I don't know the exact specs of the DAC/ADCs, but I can check - they are
easy to open. If you like I can send you a picture of the opened device
(but not before tomorrow, I don't have one with me right now).
-- Giso
-ken
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Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
2:09 p.m.
On 11/08/2010 08:55 AM, Ken Restivo wrote:
A mythical beast, rumored to exist, but never actually
seen. Others have tried, but failed, to locate it. I now join the search. This beast is:
1) USB 1.0 "class compliant"-- NOT USB 2.0 -- and thus works with Linux
2) Is well and truly supported by ALSA.
3) Has FOUR outputs and 2-4 inputs, all usable from within JACK, with good professional
quality DAC/ADCs.
4) The outputs and inputs are balanced and applicable for low or high impedance (probably
with a switch), and have TRS 1/4" jacks or XLR or both.
5) Does not cost an arm and a leg.
This does not mean the FastTrack Pro! Sure it SAYS it has 4 channels, but only two are
accessible from JACK. I have one and have used it for years, but I now need more outputs.
And, also, the output of the "other" 4 channels is just RCAs. I need 4 channels
output, USB1.0, 44.1Khz/24bit. I could use a cheap 5:1 home-theater USB fob type
interface, but the sound quality would probably suck, and it sure won't give me
balanced outs.
Does this Unicorn exist? Anyone seen one?
No, but if you can live with 48/16 instead of 24 bit, and with
RCA-outputs, the (no longer produced) Terratec "Producer Phase24 USB"
does the trick. I just tested this. It might just be that the Terratec
"DMX 6Fire USB" works the same way, but somebody else should confirm that.
Btw.: Did you try the FastTrack Pro with 48/16? Choosing between 48/24
and 48/16 also means choosing between 2 or 6 output channels on my USB
interface.
/ Hans
5:52 p.m.
On Mon, Nov 08, 2010 at 02:09:35PM +0100, Hans Wilmers wrote:
On 11/08/2010 08:55 AM, Ken Restivo wrote:
I use the FastTrack Pro USB live, currently with 44.1k/16 and get only two output channels
that JACK can use. The other two channels show up as a different ALSA interface, which
makes it useless, since JACK can only use channels that are all in the same interface.
This is why I'm looking for a unit that can do 4 channells output ON THE SAME
INTERFACE. This is important, much moreso than 24 bit support.
-ken
A mythical beast, rumored to exist, but never
actually seen. Others have tried, but failed, to locate it. I now join the search. This
beast is:
1) USB 1.0 "class compliant"-- NOT USB 2.0 -- and thus works with Linux
2) Is well and truly supported by ALSA.
3) Has FOUR outputs and 2-4 inputs, all usable from within JACK, with
good professional quality DAC/ADCs. 4) The outputs and inputs are
balanced and applicable for low or high impedance (probably with a
switch), and have TRS 1/4" jacks or XLR or both.
5) Does not cost an arm and a leg.
This does not mean the FastTrack Pro! Sure it SAYS it has 4 channels, but only two are
accessible from JACK. I have one and have used it for years, but I now need more outputs.
And, also, the output of the "other" 4 channels is just RCAs. I need 4 channels
output, USB1.0, 44.1Khz/24bit. I could use a cheap 5:1 home-theater USB fob type
interface, but the sound quality would probably suck, and it sure won't give me
balanced outs.
Does this Unicorn exist? Anyone seen one?
No, but if you can live with 48/16 instead of 24 bit, and with
RCA-outputs, the (no longer produced) Terratec "Producer Phase24 USB"
does the trick. I just tested this. It might just be that the Terratec
"DMX 6Fire USB" works the same way, but somebody else should confirm
that.
Btw.: Did you try the FastTrack Pro with 48/16? Choosing between 48/24
and 48/16 also means choosing between 2 or 6 output channels on my USB
interface.
7:22 p.m.
On Monday 08 November 2010 11:52:26 Ken Restivo wrote:
On Mon, Nov 08, 2010 at 02:09:35PM +0100, Hans Wilmers
wrote:
Can't you use those alsa modules (alsa-out or whatever - memory is dim atm) to
bring the other two into the fold?
On 11/08/2010 08:55 AM, Ken Restivo wrote:
I use the FastTrack Pro USB live, currently with 44.1k/16 and get only two
output channels that JACK can use. The other two channels show up as a
different ALSA interface, which makes it useless, since JACK can only use
channels that are all in the same interface. This is why I'm looking for a
unit that can do 4 channells output ON THE SAME INTERFACE. This is
important, much moreso than 24 bit support. A mythical beast, rumored to exist, but never
actually seen. Others have
tried, but failed, to locate it. I now join the search. This beast is:
1) USB 1.0 "class compliant"-- NOT USB 2.0 -- and thus works with Linux
2) Is well and truly supported by ALSA.
3) Has FOUR outputs and 2-4 inputs, all usable from within JACK, with
good professional quality DAC/ADCs. 4) The outputs and inputs are
balanced and applicable for low or high impedance (probably with a
switch), and have TRS 1/4" jacks or XLR or both.
5) Does not cost an arm and a leg.
This does not mean the FastTrack Pro! Sure it SAYS it has 4 channels,
but only two are accessible from JACK. I have one and have used it for
years, but I now need more outputs. And, also, the output of the "other"
4 channels is just RCAs. I need 4 channels output, USB1.0,
44.1Khz/24bit. I could use a cheap 5:1 home-theater USB fob type
interface, but the sound quality would probably suck, and it sure won't
give me balanced outs.
Does this Unicorn exist? Anyone seen one?
No, but if you can live with 48/16 instead of 24 bit, and with
RCA-outputs, the (no longer produced) Terratec "Producer Phase24 USB"
does the trick. I just tested this. It might just be that the Terratec
"DMX 6Fire USB" works the same way, but somebody else should confirm
that.
Btw.: Did you try the FastTrack Pro with 48/16? Choosing between 48/24
and 48/16 also means choosing between 2 or 6 output channels on my USB
interface.
-ken
all the best,
drew
7:23 p.m.
On Mon, Nov 8, 2010 at 1:22 PM, drew Roberts <zotz(a)100jamz.com> wrote:
Can't you use those alsa modules (alsa-out or
whatever - memory is dim atm) to
bring the other two into the fold?
as described in the newly expanding jack FAQ:
http://jackaudio.org/multiple_devices
7:29 p.m.
Emagic emi6|2m and 2|6, long discontinued by Apple. I grab them off
ebay when one pops up.
Monty
7:45 p.m.
On 11/08/2010 07:23 PM, Paul Davis wrote:
On Mon, Nov 8, 2010 at 1:22 PM, drew
Roberts<zotz(a)100jamz.com> wrote:
[OT]
Ah a new FAQ, cool. Needed for many people, to give more clarity and
kill also some myths.
[/OT]
\r
Can't you use those alsa modules (alsa-out or
whatever - memory is dim atm) to
bring the other two into the fold?
as described in the newly expanding jack FAQ:
http://jackaudio.org/multiple_devices
9 Nov
9 Nov
9:49 a.m.
On Mon, Nov 08, 2010 at 01:23:47PM -0500, Paul Davis wrote:
On Mon, Nov 8, 2010 at 1:22 PM, drew Roberts
<zotz(a)100jamz.com> wrote:
Thanks. I had a look.
Can't you use those alsa modules (alsa-out or
whatever - memory is dim atm) to
bring the other two into the fold?
as described in the newly expanding jack FAQ:
http://jackaudio.org/multiple_devices 3. Using OS facilities to merge devices into a single
pseudo-device
Ooh, great! That's just what I want...
Linux
More information is needed on this option
:-(
-ken
5310
days inactive
5311
days old
linux-audio-user@lists.linuxaudio.org
11 comments
8 participants
participants (8)
-
Clemens Ladisch -
drew Roberts -
Giso Grimm -
Hans Wilmers -
Ken Restivo -
Monty Montgomery -
Paul Davis -
rosea.grammostola