[LAU] Some Problems/Questions (about jack , qmidiarp and maybe other)

luigi curzi luigi_curzi at yahoo.it
Sat Jan 12 23:18:45 EST 2008


Il giorno Sat, 12 Jan 2008 21:10:56 +0000
John Anderson <ardour at semiosix.com> ha scritto:

> On Sat, 2008-01-12 at 19:58 +0100, luigi curzi wrote:
> > ciao/hello
> > i use  some applications on pc with a updated debian unstable to
> > make some beautiful electronic (:-)) music. i don't have external
> > midi controller or some instruments, i only use my pc. i have a
> > creative audigy es.
> > 1) what configuration can i use in jack for best performance?
> > now i use this command line:
> > /usr/bin/jackd -v -R -P70 -dalsa -dhw:0 -r48000 -p256 -n2 -P -s -zt
> > with a latency of 10.7 ms; is it important latency in my case?
> > 2) when i use vsthost with wineasio and some vsts i have some xruns
> > and i can hear some poppings? is it a normal problem?
> The basic idea is that if you're hearings pops (xruns) either you need
> to run jack with a higher latency, or you need to look at an rt (real
> time) kernel.
> Low latency is necessary if you are using a midi controller to drive a
> synth on the PC, or if you are recording and you need to do software
> monitoring.

with software monitoring do you mean the recording from software
i have a realtime kernel: 2.6.24-rc5 with realtime patch;
i have 1 gigabyte ram with a pentium 4 (2.66 gigahertz, no ht) system
and an audigy es soundcard;
in my /etc/security/limits.conf i have:
@audio          -       nice            -19
@audio          -       rtprio          95
@audio          -       memlock         512000

and i use this script when system starts:
chrt -v -f -p 80 `pgrep softirq-timer`
chrt -v -f -p 80 `pgrep softirq-hrtimer`
chrt -v -f -p 82 `pgrep IRQ-21` --> my soundcard's irq
chrt -v -f -p 98 `pgrep IRQ-8` --> rtc's irq
chrt -v -f -p 70 `pidof "jackd"`

something wrong?

> > 3) as midi arpeggiator i try to use qmidiarp (gpl but old, it is a
> > dead project?) and hypercyclic (freeware, new and very good) but i
> > can figure out how can use these softwares? precisely i don't know
> > how link these programs with jack.
> For an audio program to support jack, the programmers need to use the
> jack api. Or if the programs support alsa but not jack, there is an
> alsa-jack plugin (or whatever it's called).

qmidiarp has jack support but i don't know how use it to connect this
application with a sofsynt (for example);
there are some other new (and maybe gpl) arpeggiator?

> bye
> John


Io sono 
lo sbaglio, il momento di confusione, l'inopportuno

		Non sono niente.
	      Non sarò mai niente.
	Non posso volere d'essere niente.
A parte questo, ho in me tutti i sogni del mondo.

					F. Pessoa

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