Hello you all,
I remember more than 20 years ago playing with a “Qsound” function on soundblaster card … I searched for this type of effect to use with ardour but didn’t found plugins purposing it, anybody knows about how to apply “Qsound” effect ?
Thank you for your comments, wish you all great life. 
Sylvain.
If you are using mono files and want to make them more dimensional, you can take that mono file, duplicated it, add a very small delay adjusted to what sounds good(usually under 20millisecondsand above 3 or 5 milliseconds), and pan each channel where you think they sound best.
Reading about Haas effect will be useful.
A google search for spacial plug ins may yield results.
Hopefully this will help you get the sound you want to achieve.
EDIT : Some helpful info on HRTF here:
We considered to add some delay based panning a while ago, but it just leads to artifacts (e.g. comb filters. see The Ardour Manual - Stereo Panner).
Qsound adds delay and slight filtering between L-R channels to simulate sound direction, mostly useful for FX not music, yet it is just a gimmick compared to 3D panning and HRTF which are available these days.
Thank you very much Schmitty2005 for your detailed answer and links, I will try following your recommendations. 
Hi Robin, glad to read you again here !
Thank you for your technical answer, I just want to experiment this effect on voice during a short time in a song. (Remember “Learning to fly” by Pink Floyd ?.. short moment with Qsound, but very efficient. 
)
Wish you great life.
@seal20 I have written Faust DSP code that needs a stereo track in Ardour, takes a mono file, delays, filters, and allows panning of the Original and panning of the processed signal. If a stereo audio file is used, it will combine the left and right, creating a mono track that gets processed back into a stereo track.
There is a LV2 for Linux 64-bit and a VST for Win10 available for download. The monoSpatializer.dsp can be viewed and copied / pasted over at https://faustide.grame.fr/ . Clicking the truck icon, you can export to various formats. LV2 and VST formats are available if you want to get them that way.
I tested the LV2 on Linux Ardour and it created a similar sound, but I don’t know if it will suit your needs. I don’t program for a living so it may not be the best DSP code, but did work and gave me what I thought was a similar effect.
It is available here:
@x42
If you have time to explain, Are the white and red line in the plugin analysis window OK , a sign of bad DSP programming in my Faust code, or normal phase issues cause by such a small delay ? This plugin did seem to function as I designed it, but I did not expect the analysis window to look like that. I don’t do this for a living, just a hobby, and just decided to hack away on Faust and see what it could do.
Thank you very much Schmitty2005, I will try your code during those next days and will comment when tested.
You’re welcome. This changed my manual process to be much simpler, although I don’t do it often.
I did update it to use milliseconds instead of samples. I do have to do a few other tweaks to it, like maybe independent gain knobs for the wet /dry and also add a overall slight gain reduction.
Then maybe build a GUI with @brummer 's :
Thank you very much, I will check this in few days.
Congratulations for the developpment !..
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