I thank you for raising this issue. It's really important.
All NINJAM users never ever agree on a more advanced mix like you suggest (i wish they do), since we can't even agree on just a reduction to a certain level? I'm not sure about that, but I hope so. I've been working hard for a couple of years now to try to get people who agree in this way to be more organized and jam with better sound balances.
Btw we never met at NINJAM. At least that's the result of searching for ninbot automatic recordings, and you've been using NINJAM a lot less in the last years, I hope it's not because of the loudness issue.
Now the first thing I have to ask is, have you noticed that the volume is low on ninbot radio or automatic recordings? There is a drop of about -10 db (in 2-3 person jams).
Of course this is if we pay attention to the levels in reaNINJAM. So when we set -12db for each channel, this is how it is reflected in the stream. So if we take the drum channel as 0 (its actually -12db), sax should be -24db according to the list you gave.
We also apply a multiband limiter to all sounds to convert these streams to stream on the collective youtube channel. This allows us to bring the whole mix to around 0 db.
So since there is no option like a master channel for the jam room in NINJAM, we can only make it usable by adding multiband to the channel of the streaming computer we use for broadcasting. If everyone does this on their own, it can be more confusing.
What everyone should do is to reduce the volume to the agreed level, as you suggest. I am ok with any level we can agree on
Because if for example the sound I add is too loud and I need to lower myself to -24db, no problem. I just increase the "monitoring mix" option by +12 db to be able to hear what I'm playing, I can hear myself comfortably and the sounds in the mix will sound much clearer.
I hope one day we'll have the chance to meet in jams and test all these settings. I tried to make all the settings first in jams and then by examining the automatic recordings of these jams. I open a project as presets and then I try to re-adjust all the instrument sounds I add according to the sounds in the room. I am sure that when we change all these presets again and make jams in a more organized way, the result will be much more satisfying.
We completely agree about the general problem of behavior on the Internet. We see the reflections of this in NINJAM, some friends don't even deign to answer what is written in the chat, because they don't care
But I still hope that they will realize that NINJAM means nothing without listening to each other and for that we need a healthy mix.