Hi,
I wonder if there’s a way to view more plugins and aux send on a track in the mixer view without having to scroll.
Maybe is it possible to reduce the fader bar? -but I don’t find how 
Nope, that has a fixed height.
If you’re using Ardour on Linux or Windows, you could reduce the overall UI scale to make everything smaller (Ardour Preferences > Appearance > Size and Scale).
If you’re only interested in one track at a time. Ardour Menu > WIndow > Tracks and Busses has a large view of the processor-box.
Other than that, you could get a display with higher resolution 
I suppose another question is… why that many Plugins? Are there some changes you can make to your recording process? In my experience if the source is recorded well it often eliminates the need for EQ and often even compression. Spacial effects (reverbs, delays, chorus, flange etc) can be on busses and free up real estate on your channel strips as well.
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Hello @GMaq
I think … you’re totally right 
I think I supposed that adding plugins and plugins on track or bus after recording will simplify and add extended possibilities to the mix, but it clearly doesn’t , I’ll do your way for my next tracks
Thanks for the advice 
I have to agree with @GMaq , I try to reduce the number of plugins, keeping reverbs delays etc. on busses. (That’s the way many - or all ? - pro mixers go)
I learned a lot from Bobby Owsinski’s book “The Mixing Engineer’s Handbook”
Thanks @peter.zenk
I learned a lot from you both and others there 
I took the time to review my recording process : I found that I took a very bad habit, I changed it today
My (awful) setup was :
Guitar/Bass --physical Jack–> BOSS GT-1 --physical Jack–> Universal Audio Volt 1 --USB–> Ardour
Voice --XLR–> Universal Audio Volt 1 --USB–> Ardour
That’s why I always tried to correct sound with multiple plugins I think
My new setup is :
Guitar/bass --USB–> BOSS GT-1 --USB–> Ardour
Voice --XLR–> Universal Audio Volt 1 --USB–> Ardour
That will implies 44.1 kHz session rate (because of BOSS GT-1) instead of 48kHZ, but that should be ok
I already’ tried this setup in older Debian version ( probably Debian 11 or 10) but the GT1 BOSS wasn’t ok, it is now , so it’s time !
There does not seem to be anything wrong with that setup. Perhaps you just needed to optimize your interface settings for use with your guitar.
Don’t laugh, but I still use my old Zoom G3X for recording - also via direct USB → 44.1 kHz
(I don’t have the budget for Kemper etc. and I hate the break-up sound of contemporary low budget modellers. )
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Yes, I agree with Chris, that there’s nothing inherently wrong. Perhaps your issue with that setup is related to gain staging.
Certainly, using the native USB audio will make this a lot easier.
It may well also be that the configuration of the GT-1 output isn’t optimal: on the GT-1 you can configure what sort of device you are connecting the GT-1 to, such as combo amp, full-stack amp, headphones, etc. and this impacts the audio output by adjusting the amp/cabinet modelling.
Configure the GT-1 as if you were connected to a Marshall atack, when it’s actually plugged into an audio interface, and it’s likely to sound a bit weird.
The output setting you want is headphone/line out.
I believe the USB output is always unaffected and includes the standard GT-1 amp and cabinet modelling.
One thing to be aware of: using a USB audio device like the GT-1 like this, by default, limits you to use one device at a time. In other words, you cannot record both guitar and vocals at the same time if they are on different devices.
The reason for this is because, even if they are both set to 44.1, the devices will run at a slightly different sample rate and this can cause small audio glitches.
There are ways to get multiple interfaces working together, but the default is to only allow one audio device at a time to maintain the integrity of the captured audio.
If you record one track at a time, as I often do, this isn’t an issue.
The change came in at around kernel version 5.12 about 5 years ago. I was actually involved in testing this for Takashi as I owned a fair number of Boss products.
https://lore.kernel.org/alsa-devel/20201123085347.19667-1-tiwai@suse.de/
Cheers,
Keith