KDE 3.2 and recording with KRec
kde-multimedia at gnosys.biz
Fri Feb 27 13:21:59 GMT 2004
As far as I can determine, I have KDE 3.2 and alsa and
aRts all set up properly for sound. I can play mp3
files (using xmms and Noatun, maybe some others), CDs
(using KsCD), and I hear system notification sounds
when I get alert boxes.
However, I'm trying to learn how to use KRec for
recording from the microphone of the sound card, and
having some difficulty. I've read the KDE Manuals for
KMix, KRec, aRts Control Tool, and a couple of others,
but KRec is not working as described in it's Manual.
I do see the KRec::In and KRec::Out in the aRts
Control Tool (Audio Manager), and they are set up as
described in the KRec Manual (KRec::In connected to
the in_soundcard bus with type record).
One thing I'm not clear on is this, from the Manual:
"1) First you have to select the recording source in
your soundcard. You need your favorite mixer (KMix),
where you should select the source you need for
This is probably so simple that I'll kick myself when I
figure it out, but just how do I select the source for
recording? I have KMix open, I've read it's manual,
but it doesn't talk about selecting a recording
source. I see the right-click pop-up menu and it's
item to "Set Record Source" but I don't think I'm
understanding how to use it. Every slider that I
right click on (Line, Microphone, CD, IGain, Line1,
PhoneIn, etc.) shows that the "Set Record Source" menu
item has a check mark next to it. When I select it
(thinking it's a toggle) to turn something off as a
record source, I would expect that the check mark
would disappear from beside the entry for whatever
component I've chosen. That's not what happens. All
of the sliders have check marks next to that entry,
and none of them turn off. When I do the same thing
for the "Muted" entry in that menu, it works as I
expect, and plus, I see the green light at the top of
the slider turn on or off when muting is checked or
not, respectively. Is the red light at the bottom
supposed to correlate with the selected recording
source? The Manual gives no insight into that
question, and it doesn't even mention the "Set Record
Source" entry in that context-sensitive pop-up menu.
My ultimate goal is to select the sound card's
microphone as the recording source (as is described in
the KRec Manual above), and then move on with steps 2
and 3 below (also from the Manual).
"2) You also need to configure the aRts server for
full-duplex (and your soundcard and drivers should
support this too). If you need to restart aRts you
should also restart KRec "
I'm not sure how to verify that aRts is in full-duplex
mode. Any clues on that?
"3) If everything worked you now should see something
moving inside KRec — the VU-Meter showing how loud
your recording is. For good recordings without
clipping it should be yellow to orange but not red.
The slider right of the VU-Meter controls the volume."
Everything in 1 and 2 seems to work, but I don't see
the recording level bouncing on the KRec recording
level meter. Even if I try to choose the sound card
output as the recording source and play an mp3 file
using Noatun, I hear the output from the sound card
speakers, and see the recording level bouncing in the
aRts Master Volume levels, but not in KRec.
Any suggestions would be most welcome, and if there are
better sources for reading than what I've listed, then
perhaps someone could send me pointers.
PS. Some system details:
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