[linux-audio-user] Re: latencies

[Wolfgang Lonien]

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philicorda wrote:

>> Things have moved on a little. :) 

How true... :-)

>> What sort of latency problems are you having?

I have xruns in Alsa, qjackctl is reporting something about 40+msec of
latency, and even the metronome in Rosegarden isn't steady, esp. after
the screen starts scrolling while recording. Playback of some downloaded
 MIDI-only file is also not acceptable.

cat /proc/interrupts says:

           CPU0
  0:   38765931          XT-PIC  timer  0/65931
  1:      13071          XT-PIC  i8042  0/13071
  2:          0          XT-PIC  cascade  0/0
  3:      37813          XT-PIC  0.0  1/37811
  8:          1          XT-PIC  rtc  0/1
  9:    1318079          XT-PIC  acpi, yenta, yenta, uhci_hcd:usb1  0/18079
 10:      36863          XT-PIC  Allegro  0/36863
 14:     408326          XT-PIC  ide0  0/8326
NMI:          0
LOC:          0
ERR:          0
MIS:          0

while I write this mail - IRQ3 is gone when I try to make music, because
then I 'cardctl eject' the wireless card...

>> Remember, latency is only a monitoring issue, and should never affect
>> timing of audio to midi etc on playback.

Hmmm here everything is nice until I hit that 'record' button. Oh and I
try to do MIDI only for a start, no fancy audio stuff.

>> If the laptop and soundcard just aint gonna play nice with jack at low
>> latencies whatever you do then use the direct analog monitoring in the
>> sound cards mixer for monitoring while recording audio rather than
>> software monitoring.

Hmmm - you mean kill all audio connections in qjackctl? Yep; btdt...

>> Softsynth latency can't be got round this way, but if your midi keyboard
>> has some sounds built in, you can record listening to them, and then
>> play back the midi parts with whatever softsynth you like.

No, my MIDI keyboard is just a keyboard and doesn't produce sounds. The
MIDI out goes to a Roland SC-33, and the headphones are inserted there.
So 'recording' for me means only MIDI-on/off events. I expected *that*
at least to work.

cheers,
wjl aka Wolfgang Lonien

- --
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