arOn Wed, 23 Jan 2013 01:56:51 +0100, Len Ovens <len@xxxxxxxxxxxxx> wrote:
On Tue, January 22, 2013 1:26 pm, Bob van der Poel wrote:
Anyone with experience using the UCA202? I tried it the other day
using audacity and found that it played and recorded just fine if it
was only doing one or the other. But, if I had existing tracks in
audacity and played those (only 1 stereo) and recorded a 2nd track ...
the recorded track sounded like it was filtered though a motorboat
engine (sputter, sputter ...).
I did the recording again directing the output to an existing device
and all worked fine. So the setup seems to be useable. I am thinking
that audacity (alsa?) can't read+write to the device?
I'm running Ubuntu 12.04. Didn't have jack running.
I have found with USB audio, I have to find a USB plug that has it's own
IRQ. For example I have:
16: 12488044 0 IO-APIC-fasteoi ehci_hcd:usb1,
uhci_hcd:usb2, i915, ath9k
17: 0 0 IO-APIC-fasteoi uhci_hcd:usb3
That USB2 is the left side plug on my machine, the usb3 is the right... I
only use the one on the right. I also have found I have to unload the
wireless kernel module as it's once a minute scan gives xruns... once
every five seconds if wireless is disabled.
As already mentioned in my first reply, it's possible to unbind devices
that share the IRQ.
Another thing to do, that might help a little bit, is to make the USB port
used by the sound device head of the USB devices by rtirq. Take care that
the kernel and the rtirq script fit together. I'm using Ubuntu since
years, most of the times the rtirq script from the repositories doesn't
fit to the kernels of the repositories.
Instead of using an Ubuntu kernel, building a kernel-rt also might help a
little bit.
Some people stop all unneeded services. This never improved anything on my
machine, but it doesn't harm to stop unneeded services.
You could test jackd and set periodes/buffer (n) to 3.
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