I'm not sure I'm following this. How have you got envy24control set up? Are H/W Out 1/2 set to PCM Out 1/2 or Digital Mix L/R? I've had a problem that sounds similar when using the Digital Mix L/R combo. I found that muting all of the channels except PCM Out 1/2 cleared it up. I think it was that PCM Out 1/2 were being overdriven. Jan On Sun, 2003-11-02 at 09:20, David wrote: > Hello all ! > > What could I do about the following problem ? > > I have an M-audio delta66 + omni I/O (preamp/breakout box). This card > has an onboard digital mixer that allows hardware monitoring of inputs. > > - when setting this mixer to directly route a HW input to a PCM output, > the sound is perfectly fine. The signal goes through both an A/D and a > D/A conversion before reaching my ears. I suppose that if I had a ground > loop problem (or other analog noise source), I would hear it with such a > setup. > > - now, when using jackd to route (with no jack client in between) the > alsa capture port associated with the HW input to a playback port, the > sound is full of horrible "blips". > > I use : > > - IRQ #10 for the delta66 (I even disabled the USB controller of the > motherboard which used IRQ#11, with no better results). > - a patched for LL 2.4.19 kernel, ext2 filesystems and hdparm'ed HDs. > - alsa 0.9.6 > - a tmpfs work directory for jackd that I start with '-R' as root. > > How could I isolate the source of this very annoying problem ? > > Is there a way to route an input to an output through ALSA only without > using jackd (and the hw mixer too of course) ? Maybe that would help > tracking down the culprit ... > > I'd appreciate any hint on this. Thanks a lot ! > > -- > David
