ALSAequal on microphone

[a_guenther]

Hi,

I am building right now a baby monitor using a Raspberry Pi (based on https://ivadim.github.io/2017-08-21-fruitnanny/, with some changes). This isn't exactly Ubuntu, but Raspbian is close enough in this case, ALSA commands would work the same, so I try my luck here as I couldn't get any in the RP forum. Hope this is ok...
To cancel out some microphone noise, I was thinking a simple EQ might help already. So it should go mic -> EQ -> GStreamer. I managed to install ALSAequal and get an output, but I have the feeling it does not actually do something. When I set a very low level to all channels, it is still unchanged.

For the EQ, I followed basically this: https://scribles.net/enabling-equalizer ... al-plugin/ (https://scribles.net/enabling-equalizer-on-handsfree-sending-audio-with-alsa-equal-plugin/)

snd-aloop is loaded and my .asoundrc looks the same:
ctl.equal {

type equal
}

pcm.plugequal {
type equal
slave.pcm "plughw:Loopback,0,0"
}

pcm.equal {
type plug
slave.pcm plugequal
}
For the GStreamer configuration, I replaced "device=hw:1" with "device=equal". Shouldn't this do the job, or am I missing something?

My soundcards with the aloop:
~ $ cat /proc/asound/cards
0 [Loopback ]: Loopback - Loopback
Loopback 1
1 [ALSA ]: bcm2835_alsa - bcm2835 ALSA
bcm2835 ALSA
2 [Device ]: USB-Audio - USB PnP Sound Device
C-Media Electronics Inc. USB PnP Sound Device at usb-3f980000.usb-1.1.3, full s

The last one is the USB microphone...

[a_guenther]

It was actually not working with the EQ, seems I played around with settings, but only after a reboot they had effect. For now I have no output with the EQ setup, still suspecting my aloop...
It runs headless, I have only ALSA, no Pulseaudio etc...

Any ideas?