Amplification & noise reduction with oss4

[davidgurvich]

Hello, I've just registered after removing pulseaudio and installing oss4. First time that oss4 has installed and doesn't crash on boot. Does work well in almost every aspect except for microphone recording volume. I know that the driver and hardware work well from modifying settings in audacity. The sound that results after 30db amplification + noise reduction in audacity is audible and very clear.

What I cannot figure out is how to get that amplification with ossmix. The unmodified recording is almost inaudible and there seem to be no settings in ossmix to boost the amplification.

Selected mixer 0/High Definition Audio STAC9228X
Known controls are:
jack.fp-black.mode1 <front|center/LFE|input> (currently front)
jack.int-speaker.mode <front|input> (currently front)
jack.int-speaker.front [<leftvol>:<rightvol>] (currently 78.6:78.6 dB)
jack.fp-black.mode2 <rear|input> (currently rear)
jack.fp-black.rear [<leftvol>:<rightvol>] (currently 76.4:76.4 dB)
jack.fp-black.mode3 <side|input> (currently side)
jack.fp-black.side [<leftvol>:<rightvol>] (currently 76.4:76.4 dB)
jack.int-black.mode <spdif-out|adat|rec1-mux|rec2-mux|rec3-mux> (currently spdif-out)
record.rec1-mux.input1-mux [<leftvol>:<rightvol>] (currently 39.9:39.9 dB)
record.rec1-mux [<leftvol>:<rightvol>] (currently 20.9:20.9 dB)
record.rec1-mux.mute ON|OFF (currently OFF)
record.rec1-mux.rec1-mux <input1-mux|dig-mic1> (currently dig-mic1)
record.rec2-mux.input2-mux [<leftvol>:<rightvol>] (currently 39.9:39.9 dB)
record.rec2-mux [<leftvol>:<rightvol>] (currently 20.9:20.9 dB)
record.rec2-mux.mute ON|OFF (currently OFF)
record.rec2-mux.rec2-mux <input2-mux|dig-mic1> (currently dig-mic1)
record.rec3-mux.input3-mux [<leftvol>:<rightvol>] (currently 39.9:39.9 dB)
record.rec3-mux [<leftvol>:<rightvol>] (currently 19.4:19.4 dB)
record.rec3-mux.mute ON|OFF (currently OFF)
record.rec3-mux.rec3-mux <input3-mux|dig-mic1> (currently dig-mic1)
misc.center/lfe [<leftvol>:<rightvol>] (currently 76.4:76.4 dB)
misc.headphone [<leftvol>:<rightvol>] (currently 76.4:76.4 dB)
misc <-28.-8dB|-19.-2dB|-9.-6dB|0.0dB> (currently 0.0dB)
vmix0-enable ON|OFF (currently ON)
vmix0-rate <decimal value> (currently 48000) (Read-only)
vmix0-channels <Stereo|Multich> (currently Stereo)
vmix0-src <Fast|High|OFF> (currently High)
vmix0-outvol <monovol> (currently 25.0 dB)
vmix0-invol <monovol> (currently 25.0 dB)
vmix0.pcm8 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)
vmix0.pcm9 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)
vmix0.pcm10 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)
vmix0.pcm11 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)

[plmegalo]

Have you try to turn the "misc" setting present on this line :

misc <-28.-8dB|-19.-2dB|-9.-6dB|0.0dB> (currently 0.0dB)

to a value of -28.8 ?
I think this can be the sensitivity of the microphone but not sure...

[davidgurvich]

I actually had adjusted that before and the setting does not seem to change either output or input sound levels. I'm not sure what it is supposed to do but it is probably not doing it.

[cesium]

Hmm.. maybe changing record.rec[2 or 3]-mux.rec[2 or 3]-mux might help. Also, you can edit /usr/lib/oss/conf/oss_hdaudio.conf and add the line "hdaudio_noskip=7", and after OSS restart ("sudo soundoff" and "sudo soundon"), you might get more controls in the mixer.