Re: [Lmuse-user] insert time

[Vincent J. <v.j...@fr...>]

Le 16/09/2010 08:42, Robert Jonsson a écrit :
> Hello again,
>
> 2010/9/15 Vincent Jousse<v.j...@fr...>:
>    
>>>> I've just tried the "add empty measure" option and it works ! Thanks !
>>>> The next step is to add the opposite: removing measure (I would have liked
>>>> it 20 minutes ago ...). I think it would be very useful too.
>>>>
>>>>          
>>> Ah, well, I will add it to the list :)
>>>
>>>        
>> Will it be embedded in 1.1 version ? ;)
>>      
> Sorry, but that is unlikely for 1.1 atleast.. Keep bugging us ;)
>
>    
>>>        
>>>> I still have huge issues when I try to open a project which uses Addictive
>>>> Drums. Whether muse crashes (most of the time), or it opens the project, but
>>>> Jack stops and even if I start it again, Addictive Drums can no more make
>>>> sounds. It is very very uncomfortable and I don't know how I can help to fix
>>>> it. Please tell me what I can do to give you the good information.
>>>>
>>>>          
>>> Ok, that sounds no good.
>>>
>>> Do you mean that jack quits or does it kick muse out?
>>>
>>>        
>> most of the times, it kicks muse out. Sometimes jack stops.
>>      
>>> If muse is kicked out I think you could improve it with adding the
>>> parameters "--timeout 5000 --nozombies" to jackd.
>>>
>>> Are you running a realtime kernel?
>>>
>>>        
>> yes ->  2.6.31-11-rt
>>      
>>> What parameters are you using for jack?
>>>
>>> I use:
>>> jackd -t 5000 -Z -P90 -d alsa -d hw:0 -r 44100 -p 128
>>> with quite good results
>>>
>>>        
>> I launch jackd with qjackctl, so I can access to most of the options you
>> gave me, except -Z (--nozombies) option (unless I'm really blind !).
>> So, by disabling the real time option, I've no more issue in launching
>> the projects, but I need it to be activated !! if not, I get some
>> "lags", and I can't work with it.
>>      
> The lag you mention is normally referred to as latency. The settings
> above gives very low latency on my system.
> Actually, using realtime has no difference on latency, it is the
> buffer settings that control latency. (one could say that realtime has
> indirect effect on latency, see below)
> Small buffers low latency, large buffers high latency.
> What the realtime setting does is allow jack and muse to have the
> highest priority level. This is mainly to remove XRUNs and keep a
> steady tempo.
Sorry about my English, that's just what I mean: When I deactivate real 
time, I get not at all steady tempo and it's not usable for me.

> With realtime enabled it is possible to have smaller
> buffers, lower latency and still minimize XRUNs.
>
> Further, I think qjackctl has a specific line where you can input any
> extra parameters to jackd that don't have a specific input box.
> For recent jack1 versions (from 0.117) the -R is no longer needed.
> realtime is the default.
> To break down the info.
> -t 5000    : same as --timeout 5000, makes jack allow some slowness in
> the clients
> -Z           : not sure what the difference is, allows even slower clients?!
> -P90       : sets the priority of jack higher (possibly makes it more stable)
> -d alsa -d hw:0 : set it to my sound card
> -r 44100 : I still work in CD sample rate
> -p 128     : sets the soundcard buffer to 128, low latency ( "lag"
> should be very workable)
>
> This is quite complicated, but to get your system working as good as
> possible it's good to give it some time and try to understand as much
> as possible.
>
> Regards,
> Robert
>