[LAU] A2J-MIDI Bridge error

[Jeremy Jongepier]

On 12/21/2013 03:59 PM, Kevin Utter wrote:
> Hi Jeremy! My MIDI interface is an M-Audio MIDISPORT Uno. Unfortunately the only sound device I have available at this time is the built-in on-board sound. Alsamixer reports it as "card:  HDA Intel PCH, Chip: Realtech ALC892."  Apparently my Rolland OctaCapture isn't supported at present, or I would be using that.
> 

Hello Kevin,

Using the onboard sound shouldn't be an issue.

> Currently my Jack-2 settings are:  –realtime –timeout=4500 –no-m_lock -d alsa –device=HW:0 –rate=44100 –period=256 –dither=shaped midi=none. I haven't had a chance to try larger latency yet, but I could do that once I'm playing back sequences. 
> 

Try removing the --no-m_lock setting. You also don't need a --dither
setting, afaik you only need this in very specific usercases.

> Is there any reason to do anything with "nice" on either A2J or anything else?  I think I have most of the recommended optimizations for audio done, except for the rt kernel, but just wondered about nice, since I've seen it used, but don't see any recommendations about it.
> 

From the JACK FAQ page "How do I configure my linux system to allow JACK
to use realtime scheduling?" (http://jackaudio.org/linux_rt_config):

"Contrary to a lot of misinformation on the web, there is no reason to
include a line here that provides enhanced "niceness" control, which is
completely irrelevant for realtime scheduling and low latency audio
applications. "

> The uname -a shows:
> Linux StudioLinux 3.5.0-42-generic #65~precise1-Ubuntu SMP Wed Oct 2 20:57:18 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
> Studio is just its name reflecting location, it isn't a special blend of Linux.  
> 

You could try the Ubuntu low-latency kernel.

Best,

Jeremy

> Thanks much for your help.
> 
> Kevin
> 


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