Triggering one-shot samples doesn't work so far...

Hello,
I have installed SamplerBox and already used it during a rehearsal, but I cannot make the %%mode work...
I'd like to be able to trigger one-shot samples. I press a key and the sample plays even when i release the key.
I used the %%mode=Once function in the definition.text, but nothing happens. I still have to keep the key pressed.
My files are names like that :
48.wav
52.wav
etc.

My definition file :
%%mode=Once
%%velmode=Sample
%midinote.wav

I'm sure I'm doing wrong, but may someone help me with that?
Thanks!

I think you are not using the software/image from the site where you found the docs describing these features.
Two options (which can't be mixed either, so we're talking 3 different types):
1) samplerbox.readthedocs.io/en/latest/
2) homspace.nl/samplerbox/
The second one also has its own forum.
Regards, Hans

I downloaded the image here and used the docs from 1) samplerbox.readthedocs.io/en/latest/
So I thought it should work..
I'm going to give a try with another image with the same definition.text and see what happens...