On Sun, 2 Nov 2003 21:48:58 +0100
David <dplist(a)free.fr> wrote:
I wanted to play a guitar through jack-rack and I
heard this noise. Did
it come from jack-rack, a ladspa plugin, jackd, alsa, the soundcard ?
This is why I tried to isolate the problem, ending with a very simple
setup : jackd connects the input channel to the output channel PCM Out 1
assigned to H/W Out 1 (with the "PatchBay/Router" in envy24control). I
still get the noise.
I don't have this problem when doing true hardware monitoring of the
input : be it by assigning H/W In 1 to H/W Out 1 (with the
"Pathbay/Router") or by assigning Digital Mixer L to H/W Out 1 (with
the"Patchbay/Router") and unmuting/raising the slider of channel H/W
In 1 with the "Monitor Mixer" pane in envy24control.
A couple of suggestions for narrowing the problem down further:
1. Record something (ideally something easy to see and hear problems with - such as an
oscillator) via alsa, without jack
2. Record the same signal with jack
3. Examine the waveforms visually
If the recorded waveforms look garbled:
4. Post a small fragment or two on a web server
5. Pass along the URL so we have something more precise than "the
sound is full of horrible "blips"." ;)
If the recorded waveforms look okay:
4. Play the recordings via alsa
5. Play the recordings via jack
This should help identify where the problem is.
|)
|)enji