14 Aug
2004
14 Aug
'04
1:46 a.m.
recording seems to be working OK but:
in audacity when I record the track it sounds OK
however if I generate click track and record then (the click track is
playing while I am recording) the recording is really bad (noisy, low
quality).
I vaguely remember something about full-duplex on sounblaster not
being very good, i.e. there's something wrong when using it but don't
remember what (bitrate being forced to be very low or something along
those lines).
However I can't find any information on that subject now (I tried
google and creative site), does anybody know details and/or have some
pointers to relevant docs?
system: debian unstable, 2.6.5 kenrel (with alsa), sounblaster live
platinum (with live drive).
TIA
erik
14 Aug
14 Aug
2:21 a.m.
On Friday 13 August 2004 11:30 pm, Erik Steffl wrote:
recording seems to be working OK but:
in audacity when I record the track it sounds OK
however if I generate click track and record then (the click track is
playing while I am recording) the recording is really bad (noisy, low
quality).
I vaguely remember something about full-duplex on sounblaster not
being very good, i.e. there's something wrong when using it but don't
remember what (bitrate being forced to be very low or something along
those lines).
Which soundblaster? The "original" ISA soundblasters were like that, and the
"soundblaster PCI" cards with the ens1371 chipset have asymmetric sample
rates for playback/capture, but I can overdub with my SBLive platinum and it
sounds normal.
However I can't find any information on that subject now (I tried
google and creative site), does anybody know details and/or have some
pointers to relevant docs?
system: debian unstable, 2.6.5 kenrel (with alsa), sounblaster live
platinum (with live drive).
How do you have the mixer set up?
Which input are you recording from?
What mixer app are you using?
TIA
erik
16 Aug
16 Aug
4:49 a.m.
John Check wrote:
Line LiveDrive, Line LiveDrive Capture,
Line2 LiveDrive 1, Line2 LiveDrive Capture 1
are all the way up, guitar pod (line6) is connected to two rca
connectors on the live drive. However I was recording mono only (in
audacity) so I guess only one of them was recorded.
when recording only (no playback at the same time) the recording is
OK, when I play click track at the same time the recording is very bad.
I was recording at 44kHz, thought that might be a problem so I
switched to 48kHz but then there's no full-duplex at all (i.e. the
already recorded stuff does not play when I record).
is this a problem of my setup or audacity? (I can't get muse working,
it hangs whenever (trace reveals it's reading from some pipe) I try to
save (which is required to create audio track)). Any other simple
recording programs (that would make it possible to play the previously
recorded audio (aka full-duplex aka overdubbing)?
erik
On Friday 13 August 2004 11:30 pm, Erik Steffl wrote:
I don't remember what I read exactly (and google didn't help) and
which card exactly it applied to. I have soundblaster live! platinum
(with live drive). What software do you use? Anything specific that I
need to set?
recording seems to be working OK but:
in audacity when I record the track it sounds OK
however if I generate click track and record then (the click track is
playing while I am recording) the recording is really bad (noisy, low
quality).
I vaguely remember something about full-duplex on sounblaster not
being very good, i.e. there's something wrong when using it but don't
remember what (bitrate being forced to be very low or something along
those lines).
Which soundblaster? The "original" ISA soundblasters were like that, and the
"soundblaster PCI" cards with the ens1371 chipset have asymmetric sample
rates for playback/capture, but I can overdub with my SBLive platinum and it
sounds normal. However I
can't find any information on that subject now (I tried
google and creative site), does anybody know details and/or have some
pointers to relevant docs?
system: debian unstable, 2.6.5 kenrel (with alsa), sounblaster live
platinum (with live drive).
How do you have the mixer set up?
Which input are you recording from?
What mixer app are you using? 
5:12 a.m.
On Mon, 2004-08-16 at 02:33, Erik Steffl wrote:
John Check wrote:
is this a problem of my setup or audacity? (I can't get muse working,
it hangs whenever (trace reveals it's reading from some pipe) I try to
save (which is required to create audio track)). Any other simple
recording programs (that would make it possible to play the previously
recorded audio (aka full-duplex aka overdubbing)?
You mentioned that you are using OSS emulation. Using native ALSA
support will probably work better. Does Audacity support ALSA natively?
Lee
9:03 p.m.
On Monday 16 August 2004 02:33 am, Erik Steffl wrote:
Line LiveDrive, Line LiveDrive Capture,
Line2 LiveDrive 1, Line2 LiveDrive Capture 1
are all the way up, guitar pod (line6) is connected to two rca
connectors on the live drive. However I was recording mono only (in
audacity) so I guess only one of them was recorded.
OK my livedrive is a early revision and the RCA's are S/PDIF,
but I use the 1/4" line/mic in. Set to line it's stereo
Line-Livedrive (record ready - set to unity). It's associated capture
fader is also set to unity. Capture (main) is record ready and at 0
Things that cause distortion/phase cancellation/"howlround" (feedback with
british EQ ;):
Bringing up the main capture fader unnecessarily
Bringing up either of the AC97 faders
John Check wrote:
I haven't had to do anything special, but the last time I overdubbed a day or
two ago, I had the playback channels both frozen and muted, so I don't know
if I'm missing something about the problem as described by whoever had the
details.
On Friday 13 August 2004 11:30 pm, Erik Steffl
wrote:
I don't remember what I read exactly (and google didn't help) and
which card exactly it applied to. I have soundblaster live! platinum
(with live drive). What software do you use? Anything specific that I
need to set?
recording seems to be working OK but:
in audacity when I record the track it sounds OK
however if I generate click track and record then (the click track is
playing while I am recording) the recording is really bad (noisy, low
quality).
I vaguely remember something about full-duplex on sounblaster not
being very good, i.e. there's something wrong when using it but don't
remember what (bitrate being forced to be very low or something along
those lines).
Which soundblaster? The "original" ISA soundblasters were like that, and
the "soundblaster PCI" cards with the ens1371 chipset have asymmetric
sample rates for playback/capture, but I can overdub with my SBLive
platinum and it sounds normal. However I can't find any information on that
subject now (I tried
google and creative site), does anybody know details and/or have some
pointers to relevant docs?
system: debian unstable, 2.6.5 kenrel (with alsa), sounblaster live
platinum (with live drive).
How do you have the mixer set up?
Which input are you recording from?
What mixer app are you using? when recording only (no playback at the same time)
the recording is
OK, when I play click track at the same time the recording is very bad.
Where is the click routed?
I was recording at 44kHz, thought that might be a
problem so I
switched to 48kHz but then there's no full-duplex at all (i.e. the
already recorded stuff does not play when I record).
is this a problem of my setup or audacity? (I can't get muse working,
Well, something to keep in mind is when you add a track the output is summed,
so you might have plenty of headroom until you add the click.
I've noticed a tendency for the SBLive sound to start sucking hard once it's
had a few transients bashed into the ceiling. I could be wrong as to the
particular case, but you should be knocking 3dB off of the source track level
for every track you add to account for the summing when you overdub.
IOW 0dB to the master for 1 track, -3dB to master for 2 tracks, etc.
it hangs whenever (trace reveals it's reading from
some pipe) I try to
save (which is required to create audio track)). Any other simple
recording programs (that would make it possible to play the previously
recorded audio (aka full-duplex aka overdubbing)?
Depends on what you call simple. If you were trying MusE, I'll suggest
Rosegarden4. I like Audacity, but the lack of metering really doesn't make it
suitable for recording.
erik
17 Aug
17 Aug
5:24 a.m.
John Check wrote:
I wish I knew. How do I figure that out? Audacity has a device
setting for both recording and playback, both of which only offer
/dev/dsp. So I guess click (or whatever else I recorded first) goes to
/dev/dsp.
anything I can get to work is simple:-)
oh wow! just tried rosegarden4 (I tried the old rosegarden before but
IIRC last time I tried the new one the debian package didn't work) and
it works!!! It's somewhat confusing because I need to play first, while
it's playing I can start recording and it records while playing and both
tracks are OK! Plus it sometime complains about not being able to read
data from disk fast enough but I guess I need realtime capabilities for
that (jackd complains that my kernel does not have realtime capabilities).
thanks for the suggestion,
erik
On Monday 16 August 2004 02:33 am, Erik Steffl wrote:
...
Line
LiveDrive, Line LiveDrive Capture,
Line2 LiveDrive 1, Line2 LiveDrive Capture 1
are all the way up, guitar pod (line6) is connected to two rca
connectors on the live drive. However I was recording mono only (in
audacity) so I guess only one of them was recorded.
OK my livedrive is a early revision and the RCA's are S/PDIF,
but I use the 1/4" line/mic in. Set to line it's stereo
Line-Livedrive (record ready - set to unity). It's associated capture
fader is also set to unity. Capture (main) is record ready and at 0 Things that cause distortion/phase
cancellation/"howlround" (feedback with
british EQ ;):
Bringing up the main capture fader unnecessarily
Bringing up either of the AC97 faders
ok, what's record ready, set to unity and capture main?
the one called simply 'Capture' doesn't seem to effect recording
'AC97 Capture' and 'AC97' do not have any effect either
actually nothing does except of Line2 LiveDrive Capture 1 (Line2
LiveDrive 1 controls how much I can hear but not the recording).
No matter how I set those other ones the recording is same (recording
is OK, overdubbing is really bad)
when
recording only (no playback at the same time) the recording is
OK, when I play click track at the same time the recording is very bad.
Where is the click routed? > I was recording at 44kHz, thought that might be
a problem so I
>switched to 48kHz but then there's no full-duplex at all (i.e. the
>already recorded stuff does not play when I record).
ok, there is full-duplex with 48kHz, I just turned it off (but it
sound just as bad as 44kHz).
is this a
problem of my setup or audacity? (I can't get muse working,
Well, something to keep in mind is when you add a track the output is summed,
so you might have plenty of headroom until you add the click.
I've noticed a tendency for the SBLive sound to start sucking hard once it's
had a few transients bashed into the ceiling. I could be wrong as to the
particular case, but you should be knocking 3dB off of the source track level
for every track you add to account for the summing when you overdub.
IOW 0dB to the master for 1 track, -3dB to master for 2 tracks, etc.
it hangs whenever (trace reveals it's reading
from some pipe) I try to
save (which is required to create audio track)). Any other simple
recording programs (that would make it possible to play the previously
recorded audio (aka full-duplex aka overdubbing)?
Depends on what you call simple. If you were trying MusE, I'll suggest
Rosegarden4. I like Audacity, but the lack of metering really doesn't make it
suitable for recording.
14 Aug
14 Aug
2:24 a.m.
On Fri, 2004-08-13 at 23:30, Erik Steffl wrote:
recording seems to be working OK but:
in audacity when I record the track it sounds OK
however if I generate click track and record then (the click track is
playing while I am recording) the recording is really bad (noisy, low
quality).
I vaguely remember something about full-duplex on sounblaster not
being very good, i.e. there's something wrong when using it but don't
remember what (bitrate being forced to be very low or something along
those lines).
However I can't find any information on that subject now (I tried
google and creative site), does anybody know details and/or have some
pointers to relevant docs?
system: debian unstable, 2.6.5 kenrel (with alsa), sounblaster live
platinum (with live drive).
The hw:x,0 capture device on the sb live is not very good. For good
results you have to use the hw:x,0 playback device and the hw:x,2
capture device. You have to use 48khz.
To record at the lowest latencies you have to record more than 2
channels. This is because the capture buffer size is fixed in bytes;
doubling the number of channels halves the amount of time between
interrupts with a fixed buffer size.
This did not work at all until very recently, I believe you need the
ALSA 1.0.6-rc1 release candidate.
Search the recent alsa-devel archives for 'emu10k1 low latency capture'
and 'emu10k1 multichannel' for more info.
Lee
16 Aug
16 Aug
4:25 a.m.
Lee Revell wrote:
On Fri, 2004-08-13 at 23:30, Erik Steffl wrote:
thanks for the info, now I have to figure out how to use it:-) it
looks like audacity uses oss (/dev/dsp) so I guess I could configure
alsa so that /dev/dsp is hw:x,0 and e.g. /dev/dsp1 is hw:x,2
right now I'm not even at the point of caring for latency, for some
reason the recording is of really bad quality when I use full-duplex
(i.e. playback of click track and record), the quality is OK if I only
record.
erik
recording seems to be working OK but:
in audacity when I record the track it sounds OK
however if I generate click track and record then (the click track is
playing while I am recording) the recording is really bad (noisy, low
quality).
I vaguely remember something about full-duplex on sounblaster not
being very good, i.e. there's something wrong when using it but don't
remember what (bitrate being forced to be very low or something along
those lines).
However I can't find any information on that subject now (I tried
google and creative site), does anybody know details and/or have some
pointers to relevant docs?
system: debian unstable, 2.6.5 kenrel (with alsa), sounblaster live
platinum (with live drive).
The hw:x,0 capture device on the sb live is not very good. For good
results you have to use the hw:x,0 playback device and the hw:x,2
capture device. You have to use 48khz.
To record at the lowest latencies you have to record more than 2
channels. This is because the capture buffer size is fixed in bytes;
doubling the number of channels halves the amount of time between
interrupts with a fixed buffer size.
This did not work at all until very recently, I believe you need the
ALSA 1.0.6-rc1 release candidate.
Search the recent alsa-devel archives for 'emu10k1 low latency capture'
and 'emu10k1 multichannel' for more info.
7214
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linux-audio-user@lists.linuxaudio.org
7 comments
3 participants
participants (3)
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Erik Steffl -
John Check -
Lee Revell