On Sun, 2 Nov 2003 21:48:58 +0100 David <dplist@xxxxxxx> 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
