On Mon, 7 Oct 2002, Juhana Sadeharju wrote:
> Hello. There is something odd going on with emu10k/SB Live driver.
> I have drivers version 0.90rc1.
>
> First, the capture faders and switches seems to not work as
> one could figure out by reading the "SB-Live-mixer.txt".
> Second, after unintuitively capturing the Drive/line-in2, the
> signal levels differs with respect to MS Windows drivers.
>
> In MS Windows I have recorded audio from a tuner. The signal levels
> peaks approximately at -6 dB as one could expect from standard
> broadcasting. So, this could indicate that Alsa has something wrong,
> but I'm not sure. Because Alsa produces higher level signal, there
> is a change that Alsa is clipping/distorting the signal.
>
> People like me who want to move from MS Windows to GNU/Linux
> thinks that it is the Alsa which works badly. You merely have to
> prove us that Alsa works ok. Please do so now.
>
> -*-
>
> The signal paths should be so that it is possible to record
> the data directly from A/D converter without additional gains
> or filterings. Does Alsa work this way? Can you provide me
> a complete signal path diagram of the Alsa driver?
It should, but you know, all samples goes through the DSP, so it depends
on the firmware.
> -*-
>
> There is something weird in the mixer with SB Live/line-in2:
> It does not make any difference even if recording mode
> is on or off, or if capture levels are 0 or 100.
>
> The description in "alsa-kernel/Documentation/SB-Live-mixer.txt" and
> the real system does not match.
>
> Well, it would be nice if the diagrams would look like the following:
>
>
> capture <--------------------------------------------------
> | | | | |
> mute mute mute mute mute
> | | | | |
> fader fader fader fader fader
> | | | | |
> line line2 mic etc.
>
> monitor <--------------------------------------------------
> | | | | |
> mute mute mute mute mute
> | | | | |
> fader fader fader fader fader
> | | | | |
> line line2 mic etc.
>
>
> There is a Drive/line-in2 mute button in MS Windows but not in Alsa.
> Only way to mute is to turn the common recording/playing fader down,
What is common recording/playing fader? Name?
> in which case the recording is not possible (should be because I may
> only dislike listening). Note that the line-in2 capture fader and switch
> has no effect whatsoever -- because the system seems to be broken.
>
>
> This must also mean that it is not possible to apply effects to
> line-in2: because line-in2 cannot be muted I would hear both the
> line-in2 and the effect return (of effected line-in2), causing
> phase effects and other problems. Because wave is also missing
> the mute, what would be recorded? Perhaps not the plain line-in2,
> but mix of line-in2 and the effect return. How it is?
> It would be important to be able to record the line-in2 only.
Line2 cannot be muted for playback but can be turned off for capture.
> -*-
>
> Can somebody verify these problems? Plug audio input to Drive/line-in2
> and report the alsamixer settings when recording. Does the capture
> fader or switch affect the recording? Please, verify by trying.
I have no LiveDrive or LiveDrive II. It might be possible that I/O pins of
EMU10K1 might be connected differently than our firmware expects. It might
be bug of firmware or other.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project http://www.alsa-project.org
SuSE Linux http://www.suse.com
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