Is there a way to make microphone works using external usb sound card ?

1st Official Post

    I'm using USB sound card (GeneralPlus), audio output is working fine, I can hear sound in USB audio card.

    However I can't make the microphone input to works, the microphone device is detected by 'alsamixer' and 'lsusb' command, but no sound.

    Also LibreELEC seem removing some alsa-utils command, like 'arecord' and 'alsaloop', is there a way to make microphone works ?

    I think Karaoke will be a nice feature on a media box (I'm using amlogic box),

    btw, Lakka which based on LibreELEC recently adding 'libretro_pocketcdg', a small karaoke player, which works very well, but lack of microphone support, since it based on LibreELEC, it's alsa-utils package is stripped too.

    Also as we know, Kodi will support libretro in future, which mean libretro_pocketcdg could be launched directly from Kodi