[LAU] online calls with decent auido for music lessons

Giso Grimm gg3137 at vegri.net
Mon Mar 15 18:59:55 CET 2021

Hi Lorenzo,

yet another option could be the ovbox:


Works also as a command line application. It uses jack for audio,
provides spatial audio, and relies on zita-njbridge for the
audio-to-network conversion and back (including adaptive resampling).

Completely open source.

Delays should be similar to those provided by jacktrip or soundjack, and
quality will mostly depend on the last mile of the internet connection.



On 15.03.21 16:37, Lorenzo Sutton wrote:
> Hi LAU,
> As we're entering a 'tighter' lock-down in my area this week I will need
> to attend online music lessons (bass). The suggested tool is zoom with
> 'original sound' option selected, but it seems this is not available on
> Linux (nor in a web (chrome?) client) [1].
> In the past setting the 'noise reduction' (or maybe it's echo
> cancellation) to low seemed to work OK, but I'm wondering if anyone
> knows of any work-arounds.
> Or any other platform (Discord seems to use Opus which sounds promising).
> The one used for the last LAC seemed also quite nice, but I guess that's
> not free (as in 'gratis')? As zoom is the tool selected by the music
> school it should also be something relatively hassle-free for the
> teacher and cross-platform (i.e. assume they will not be on Linux, so no
> funky stuff like having to install a Mumble server etc. :-| ... Although
> the offers on mumble.com seem quite reasonable, but has anyone used it
> for music?)
> I _am_ already able to set-up e.g. my Zoom H5 (the device not the
> software) or usb audio interface via JACK to have a decent mic/input at
> the source and then pulseaudio-jack sink for audio I/O with these apps
> (I actually helped my son do remote drum lessons which included piping
> smplayer via jack to him locally and his teacher as well as the e-drum
> line out with JACK).
> But of course there's no much point in having decent quality at the
> source if the software is doing funky stuff like noise reduction and
> echo cancellation at the source :-|
> Any suggestion welcome.
> Lorenzo.
> [1] e.g.
> https://www.reddit.com/r/Zoom/comments/g9qu9v/original_sound_and_stereo_options_missing_on/
> https://support.zoom.us/hc/en-us/articles/115003279466-Enabling-option-to-preserve-original-sound
> [2]
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