[alsa-devel] GR-55 Driver

Daniel Mack zonque at gmail.com
Tue May 17 12:11:14 CEST 2011

On Mon, May 16, 2011 at 11:33 PM, Jeffrey Scott Flesher Gmail
<jeffrey.scott.flesher at gmail.com> wrote:
> # alsamixer -D hw:GR55
> This sound device does not have any controls.
> ***
> # amixer -D hw:GR55 controls
> [Nothing]

That's possible.

> ***
> # cat /proc/asound/GR55/stream0
> Roland GR-55 at usb-0000:00:12.2-4, high speed : USB Audio
> Playback:
>   Status: Stop
>   Interface 0
>     Altset 1
>     Format: S32_LE
>     Channels: 2
>     Endpoint: 5 OUT (ASYNC)
>     Rates: 44100
>     Data packet interval: 125 us
> Capture:
>   Status: Stop
>   Interface 1
>     Altset 1
>     Format: S32_LE
>     Channels: 2
>     Endpoint: 4 IN (ASYNC)
>     Rates: 44100
>     Data packet interval: 125 us
> ***
> # cat /proc/asound/GR55/midi0
> GR-55

Looks ok.

> ***
> # aplay -D plughw:GR55,0,0 /usr/share/sounds/alsa/Front_Center.wav
> Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
> [No sound]

Can you try this with a 44100/16bit file?

> I am facing two problems, I am unfamiliar with this piece of equipment and as a result, I'm unsure how to test it.
> Testing Audio function:
> I tested it with Audacity in Windozes and it works;  in Linux I set it up the same way: GR-55 USB Audio (hw:1,0) as recording device; no sound.

Are you sure hw:1,0 refers to your GR-55? Check the entries in
/proc/asound/cards again, please.

> Using Logitech Webcam software I can record the guitar output; Using Cheese, I do not get Audio.

So you DO in fact get audio from the device then with some tool?

> Testing MIDI function:
> I'm going to call tech support on this one; I have not found a Windows app that seems to work with the MIDI;

For Windows, Midi-OX is a good tool to test with: http://www.midiox.com/

> so I can not expect to test this in Linux yet; I would like to be able to convert notes into sheet music; I tried TuxGuitar, but must admit I don't know how to get it to work with MIDI input, or if it even does.

For Linux, use amidi. "amidi -l" will list all available MIDI ports.
For example to dump all incoming messages, use "amidi --port hw:X,0
--dump". And to send messages, use "--send-hex" and make sure you send
valid MIDI messages, otherwise the other side won't do anything.

> I'm going to keep on this till I get it 100%; I have patience; lets hope you do too.

Well, I believe the quirks patch is correct, and there's only software
configuration issues left.


More information about the Alsa-devel mailing list