Here I've uploaded plot graph as an abstraction plus two other abstractions to assist in its usage make-plot and cursor-drive

plot-graph creation: plot-graph unique-name size-x size-y;
Address the settings with messages to in-unique-name (eg [s in-$0-channel-L] or connect a control-rate wire to top left corner;

make-plot creation: make-plot array-name plot-resolution;
eg [make-plot $0-left-channel 200]
make-plot is used to take the audio file size given by soundfiler and divide that by the x resolution of the plot-graph window, read the array in chunks of the min max amplitudes to plot the waveform.

cursor-drive creation: [cursor-drive x resolution] eg [cursor-drive 200] drives the play cursor if active

For best results I found it best to keep the resolution to half the window size, say 200 window 100 resolution

SETTINGS. for plot-graph
size float float (can be set as a creation arg);
min float (y value <= 0 for peaks -1 to 0);
max float (y values>= 0 for peaks 0 to 1);
index float (x value 0 to resolution cur float (x position for cursor 0 to resolution);
cur-vis float (hide/show cursor 0 or 1);
min-vis float (hide/show min plot 0 or 1);
max-vis float (hide/show max plot 0 or 1);
colour float float float float float float;
where:-;
float 1 = back colour (0 to 999 struct colours);
float 2 = border colour (0 to 999 struct colours);
float 3 = plot colour (0 to 999 struct colours);
float 4 = cursor colour (0 to 999 struct colours);
float 5 = plot thickness (1 to 5ish);
float 6 = border thickness (0 to 30ish);
plot-fill float (hide/show fill 0 or 1)
fill-col float float (0 to 999 thickness 0 to 5)

For an animated plot with fill try the following in the plot-graph-help
load audio file
click 100 resolution
click look here for more
scale x using the number-box to 200
toggle off min-vis and cursor-vis
click play (and loop if a small file)
in the more page
toggle scope plot
toggle fill plot
adjust normalise
play with the colours

plot-graph.pd and plot-graph-help.pd are read only to prevent overwriting the defaults, change this if you wish

Have fun
Cheers
Balwyn

plot-graph.zip
The picture is reduced to 70%

@lo94 looking at all those connections I thought I would mention the built in intelligent patching.
where you can select all the nodes you want to connect, proceed to connect the first wire but hold the mouse button down, then tap the the shift key.. voila! all connected.
one to many, many to many, many to one

@svanya take a look at B14.sampler.rockerfella.pd in the /doc/3.audio.examples

This may be of no use whatsoever

I've just resurrected an old Lenovo Android tablet and reinstalled MobMuPlat then I installed 'Shell Terminal Emulator'
I copied my dir.mmp, dir.pd and dirtext.txt to the MobMuPlat folder
I then copied about six wav files to the music folder
Then ran Shell Terminal Emulator and entered after the prompt..

find /sdcard/music/ -type f >/sdcard/MobMuPlat/dirtext.txt

Then ran MobMuPlat dir.mmp
And yes! the menu had the filenames I copied

Plus all the files (about 150) in the other system folders in the Music folder - oops!

The filenames are preceded by the folder names however, eg /sdcard/music/drum.wav

Ah well, now I'm stumped, and I solved my menu issue (case sensitivity).
I would be pretty sure there would be a script that could fill the text file then start MobMuPlat filename, but I its out of my league

I managed to get a slider to write to a label but couldn't manage to fill a menu

it just occurred to me that your project would be running on a phone or tablet is the pd file on a PC?

if you are running windows, you could start a batch file first that creates a text file of the directory
e.g. dir2text.bat that uses the /b/a-d flags to strip the unwanted file data
this copies the *.wav file names from my desktop\loops folder to dir-list.txt in a folder dir-list on my desktop

dir /b /a-d C:\Users\David\Desktop\loops\*.wav > c:\Users\David\Desktop\dir-list\dirtext.txt
exit

then in pd

maybe more useful to the @yannseznec ys.granular.pd would be this kind of plot
This one fits the whole table to the 1024 element display, is visually scalable and has a milliseconds played cursor

Edited 11/08/2022 fixed an error where I used x y x1 y1 instead of x1 y1 x2 y2 in the template which caused the need to adjust the y position of the plot by -1.5. the file and pic have been updated. I've also added a zero to the end of [plot vector c3 1 y] to centre the y axis
here is the new pd file wave-display.pd

in response to this thread I thought I would give graphing audio in a data structure a go.
This is my result
scope-trace.pd
Edited 11/08/2022 fixed an error where I used x y x1 y1 instead of x1 y1 x2 y2 in the template which caused the need to adjust the y position of the plot by -1.5. the file and pic have been updated. I've also added a zero to the end of [plot vector c3 1 y] to centre the y axis