21 Sep
2008
21 Sep
'08
1:35 a.m.
Hi Folks
Just when I thought that everything was going well, I have hit a
problem. I have disabled the hd-intel sound card on my laptop to get
rid of Jack xruns - which it did.
Since doing that, I have had some issues with the Alsa configuration;
although I thought everything was supposed to hotplug, it appeared that
Alsa was still looking for the hd-intel card. This may just be a Gentoo
quirk.
Alsaconf doesn't work with USB devices, which makes it pretty useless,
so I had to wade through some configuration files and change lines so
that that the modprobe aliases for card0 went to snd-usb-audio. With a
bit more fiddling and a couple of reboots, I got audio working again
with my external Behringer sound card.
So far, so good.
Now, for some strange reason, MIDI seems to be broken. When I plug in
my Roland PC-300 MIDI controller and hook it up with Jack to a softsynth
or to Rosegarden, nothing happens. I flipped the switch on the back
that sets the output to go to the 'real' MIDI port rather than through
the USB system, hooked it into a 'real' synth module and it worked fine.
This is what my ALSA setup looks like:
Advanced Linux Sound Architecture Driver Version 1.0.15 (Tue Nov 20
19:16:42 2007 UTC).
/proc/asound/devices:
0: [ 0] : control
1: : sequencer
16: [ 0- 0]: digital audio playback
24: [ 0- 0]: digital audio capture
32: [ 1] : control
33: : timer
40: [ 1- 0]: raw midi
/proc/asound/cards:
0 [default ]: USB-Audio - USB Audio CODEC
Burr-Brown from TI
USB Audio CODEC at usb-0000:00:1d.0-2, full s
1 [PC300 ]: USB-Audio - PC-300
Roland PC-300 at usb-0000:00:1d.7-3.4, full speed
I dont' think that the PC-300 is broken because a) it is recognised and
b) works OK when directed to its MIDI port.
Although all the Jack connections LOOK correct, no MIDI data gets from
the keyboard to wherever I'm sending it. (That includes doing a
loopback through Jack so that the PC-300 inbound is connected to its
hardware MIDI out.)
My suspicion is that ALSA is to blame but how and why, I have no idea.
I notice another ALSA quirk - if I fire up alsamixer, it only shows the
playback channel of my USB sound device, not the capture channel.
Running this with the hd-intel card, I see all channels.
Ideas, anyone?
Cheers
M
--
Matthew Smith
Smiffytech - Technology Consulting & Web Application Development
Business: http://www.smiffytech.com/
Personal: http://www.smiffysplace.com/
LinkedIn: http://www.linkedin.com/in/smiffy
21 Sep
21 Sep
3:20 a.m.
Quoth Matthew Smith at 2008-09-21 13:05...
...
Now, for some strange reason, MIDI seems to be broken.
When I plug in
my Roland PC-300 MIDI controller and hook it up with Jack to a softsynth
or to Rosegarden, nothing happens. I flipped the switch on the back
that sets the output to go to the 'real' MIDI port rather than through
the USB system, hooked it into a 'real' synth module and it worked fine.
Just answering my own post to provide further information:
1) I have managed to use the keyboard OK with software on Windows XP
under VMWare.
2) Using aplaymidi, I have been able to send data out of the MIDI out on
the keyboard.
3) Using arecordmidi, nothing seems to be captured.
This suggests that the keyboard is working normally and that something
is amiss with ALSA receiving MIDI data.
--
Matthew Smith
Smiffytech - Technology Consulting & Web Application Development
Business: http://www.smiffytech.com/
Personal: http://www.smiffysplace.com/
LinkedIn: http://www.linkedin.com/in/smiffy
11:09 p.m.
New subject: ALSA ate my MIDI! (Or Something)
I have a Roland PCR-M80 and it works just fine via usb. Have you tried to
use the USB connection instead of the hard midi one?
On Sat, Sep 20, 2008 at 10:20 PM, Matthew Smith <matt(a)smiffytech.com> wrote:
Quoth Matthew Smith at 2008-09-21 13:05...
...
--
The Revolting X Software/Music Production:
http://diastrofunk.com
Now, for some strange reason, MIDI seems to be
broken. When I plug in
my Roland PC-300 MIDI controller and hook it up with Jack to a softsynth
or to Rosegarden, nothing happens. I flipped the switch on the back
that sets the output to go to the 'real' MIDI port rather than through
the USB system, hooked it into a 'real' synth module and it worked fine.
Just answering my own post to provide further information:
1) I have managed to use the keyboard OK with software on Windows XP
under VMWare.
2) Using aplaymidi, I have been able to send data out of the MIDI out on
the keyboard.
3) Using arecordmidi, nothing seems to be captured.
This suggests that the keyboard is working normally and that something
is amiss with ALSA receiving MIDI data.
--
Matthew Smith
Smiffytech - Technology Consulting & Web Application Development
Business: http://www.smiffytech.com/
Personal: http://www.smiffysplace.com/
LinkedIn: http://www.linkedin.com/in/smiffy
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11:37 p.m.
New subject: ALSA ate my MIDI! (Or Something)
Quoth Miguel Morales at 2008-09-22 10:39...
I have a Roland PCR-M80 and it works just fine via
usb. Have you tried
to use the USB connection instead of the hard midi one?
That's what I'm using. The keyboard is the only MIDI interface I have.
It has a single MIDI out port - which is working fine when tested with
amidiplay. There is no hard MIDI in port - the keyboard can either
output to the onboard out port (to another MIDI device) or through the
USB interface, which is what I am doing.
ALSA is not getting inbound data from the device although it can send
OK. The keyboard works as it should under Windows, so I can only guess
that there is something wrong with ALSA - either a mis-configuration or
a bug - but I don't even know where to start looking.
Cheers
M
--
Matthew Smith
Smiffytech - Technology Consulting & Web Application Development
Business: http://www.smiffytech.com/
Personal: http://www.smiffysplace.com/
LinkedIn: http://www.linkedin.com/in/smiffy
22 Sep
22 Sep
1:37 a.m.
New subject: ALSA ate my MIDI! (Or Something) - RESOLVED
Quoth Matthew Smith at 2008-09-22 11:07...
ALSA is not getting inbound data from the device
although it can send
OK. The keyboard works as it should under Windows, so I can only guess
that there is something wrong with ALSA - either a mis-configuration or
a bug - but I don't even know where to start looking.
Want to know what was stopping it working? Do you?
USB hub. Yep, a nasty little bit of $10 hardware.
The keyboard was connected through a USB hub. When I traced through the
wiring, found this and plugged directly into the computer, it all
started working.
Any USB gurus like to tell us why that was?
Cheers
M
--
Matthew Smith
Smiffytech - Technology Consulting & Web Application Development
Business: http://www.smiffytech.com/
Personal: http://www.smiffysplace.com/
LinkedIn: http://www.linkedin.com/in/smiffy
5:02 a.m.
New subject: ALSA ate my MIDI! (Or Something) - RESOLVED
On Mon, 22 Sep 2008 13:07:07 +0930
Matthew Smith <matt(a)smiffytech.com> wrote:
Quoth Matthew Smith at 2008-09-22 11:07...
At a guess - some USB hubs only work at USB 1 (or so I've read)
--
Will J Godfrey
http://www.musically.me.uk
ALSA is not getting inbound data from the device
although it can send
OK. The keyboard works as it should under Windows, so I can only guess
that there is something wrong with ALSA - either a mis-configuration or
a bug - but I don't even know where to start looking.
Want to know what was stopping it working? Do you?
USB hub. Yep, a nasty little bit of $10 hardware.
The keyboard was connected through a USB hub. When I traced through the
wiring, found this and plugged directly into the computer, it all
started working.
Any USB gurus like to tell us why that was?
Cheers
M 
7:52 a.m.
New subject: ALSA ate my MIDI! (Or Something) - RESOLVED
Folderol wrote:
On Mon, 22 Sep 2008 13:07:07 +0930
Matthew Smith <matt(a)smiffytech.com> wrote:
Also, some USB hubs may not provide the full spec of power to every port
on the hub if you happen to be using all of them. I'm using 5 of the 6
available ports on my little powered Zonet USB2 hub (with transfer rate
to prove it!) but if I add my 2.5" external notebook hard drive to the
last available port, the drive doesn't get enough juice to power up and
make a connection. Directly connected to the computer, it works fine.
If it's really a USB1 hub, it may not be providing enough power for
everything connected to the hub when you plugged your keyboard into?
--
David
gnome(a)hawaii.rr.com
authenticity, honesty, community
Quoth Matthew Smith at 2008-09-22 11:07...
At a guess - some USB hubs only work at USB 1 (or so I've read) ALSA is not getting inbound data from the device
although it can send
OK. The keyboard works as it should under Windows, so I can only guess
that there is something wrong with ALSA - either a mis-configuration or
a bug - but I don't even know where to start looking.
Want to know what was
stopping it working? Do you?
USB hub. Yep, a nasty little bit of $10 hardware.
The keyboard was connected through a USB hub. When I traced through the
wiring, found this and plugged directly into the computer, it all
started working.
Any USB gurus like to tell us why that was?
Cheers
M
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6 comments
4 participants
participants (4)
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david -
Folderol -
Matthew Smith -
Miguel Morales