8 Dec
2020
8 Dec
'20
5:16 p.m.
I'm trying to put together a church organ, using two midi keyboards.
Unfortunately, they both
power on as channel 0. I can easily interpose a bit of jack code that
changes the channel
but I currently have no way of knowing which is which. They don't appear
to send any useful
information like serial number, and all I can rely on is that they will
always be plugged
in to the same slot each time (as it's all going to be cased up). I can
put them on different
USB Hubs if that is helpful. Any suggestions welcomed.
Bill
--
+----------------------------------------+
| Bill Purvis |
| email: bill(a)billp.org |
+----------------------------------------+
8 Dec
8 Dec
5:31 p.m.
Hi,
if the USB device id is different for the two usb devices then you might
just write a custum udev-rule that loads the snd-usb-audio module with
different card index parameters..
Regards,
FPS
On 12/8/2020 4:16 PM, Bill Purvis wrote:
I'm trying to put together a church organ, using
two midi keyboards.
Unfortunately, they both
power on as channel 0. I can easily interpose a bit of jack code that
changes the channel
but I currently have no way of knowing which is which. They don't appear
to send any useful
information like serial number, and all I can rely on is that they will
always be plugged
in to the same slot each time (as it's all going to be cased up). I can
put them on different
USB Hubs if that is helpful. Any suggestions welcomed.
Bill
--
https://fps.io
5:44 p.m.
On 08/12/2020 15:30, Florian Paul Schmidt wrote:
Hi,
if the USB device id is different for the two usb devices then you might
just write a custum udev-rule that loads the snd-usb-audio module with
different card index parameters..
Regards,
FPS
That's my problem, the keyboards are identical models and the only thing
that
will distinguish them is the slot they are plugged into. I haven't got
as far
as plugging both in and looking if there is a correlation between the
information
provided by lsusb and the Alsa slot id. I think I can get them on
separate hubs
which might be useful. I know very little about what goes on when
devices are
initialised. If all else fails, I'll have to plug one into an Arduino
and use
that to shift the channel number, but I had hoped to avoid going that far!
Bill
--
+----------------------------------------+
| Bill Purvis |
| email: bill(a)billp.org |
+----------------------------------------+
6:40 p.m.
Hello,
On 08-12-2020 16:44, Bill Purvis wrote:
On 08/12/2020 15:30, Florian Paul Schmidt wrote:
If the keyboards are on different USB buses you can use that difference
to distinguish between them. Like Florian said you can use Udev for
this. Did a quick search and this might be useful:
https://github.com/dh1tw/remoteAudio/wiki/Persistent-USB-Mapping-of-Audio-d…
lsusb can tell you which keyboard lives on which USB bus, bear in mind
that different USB ports can live on the same bus. So the trick is to
find out if there are USB ports living on different buses and connecting
the keyboards to those specific ports.
Best,
Jeremy
Hi,
if the USB device id is different for the two usb devices then you might
just write a custum udev-rule that loads the snd-usb-audio module with
different card index parameters..
Regards,
FPS
That's my problem, the keyboards are identical models and the only thing
that
will distinguish them is the slot they are plugged into. I haven't got
as far
as plugging both in and looking if there is a correlation between the
information
provided by lsusb and the Alsa slot id. I think I can get them on
separate hubs
which might be useful. I know very little about what goes on when
devices are
initialised. If all else fails, I'll have to plug one into an Arduino
and use
that to shift the channel number, but I had hoped to avoid going that far!
Bill
6:55 p.m.
On 08/12/2020 16:40, Jeremy Jongepier wrote:
Hello,
On 08-12-2020 16:44, Bill Purvis wrote:
Thanks, Jeremy, that should be sufficient for my purposes!
Great guy!
Bill
--
+----------------------------------------+
| Bill Purvis |
| email: bill(a)billp.org |
+----------------------------------------+
On 08/12/2020 15:30, Florian Paul Schmidt wrote:
If the keyboards are on different USB buses you can use that difference
to distinguish between them. Like Florian said you can use Udev for
this. Did a quick search and this might be useful:
https://github.com/dh1tw/remoteAudio/wiki/Persistent-USB-Mapping-of-Audio-d…
lsusb can tell you which keyboard lives on which USB bus, bear in mind
that different USB ports can live on the same bus. So the trick is to
find out if there are USB ports living on different buses and connecting
the keyboards to those specific ports.
Best,
Jeremy Hi,
if the USB device id is different for the two usb devices then you might
just write a custum udev-rule that loads the snd-usb-audio module with
different card index parameters..
Regards,
FPS
That's my problem, the keyboards are identical models and the only thing
that
will distinguish them is the slot they are plugged into. I haven't got
as far
as plugging both in and looking if there is a correlation between the
information
provided by lsusb and the Alsa slot id. I think I can get them on
separate hubs
which might be useful. I know very little about what goes on when
devices are
initialised. If all else fails, I'll have to plug one into an Arduino
and use
that to shift the channel number, but I had hoped to avoid going that far!
Bill
1540
days inactive
1540
days old
linux-audio-user@lists.linuxaudio.org
4 comments
3 participants
participants (3)
-
Bill Purvis -
Florian Paul Schmidt -
Jeremy Jongepier