Leaving out noteoff bugs Alex-version

I use Alex's version of samplerbox from http://samplerbox.readthedocs.io.

So I have a simple script to test the samplerbox without using a midi-device. The script can be found here:
https://gitlab.com/rienheuver/electrophone/blob/master/midi_tester.py
The problem is that when I play a note, it will then also play another note a few pitches higher and another etc. until it ends in a high pitch noise. If I add a noteoff, it will fix the problem. However, I don't want noteoffs because I'm building a percussion midi-instrument. My definitions file looks like this:
%%mode=Once
%notename.wav

I have been debugging in the code and can't find it yet. The midi-note is only received once by SamplerBox. Any clue what's going on here? I'd love to be able to fix this.

Hi Rien,

I think I'm struggling with the same problem and the solution seems in this post:

http://www.samplerbox.org/forum/46

But I'm not sure how to do it, maybe you?!.
When I play my samplerbox from an USB keyboard it's all good,uhh,.. OK I got some hanging notes quite often... But when I play it from my midisequencer it doesn't work, only some notes once in a while.
My midisequencer doesn't send noteoffs, only noteon's with a velocity of 0.
That shouldn't be a problem cause it's the midi standard and I never had this problem before with my sequencer. But I guess it's the problem now, any help would be appreciated.

Ok, I was able to fix the problem simply by not being a stupid as before (and tracing my stupidity). My definitions file was called definitions.txt instead of definition.txt
It now works beautifully :P.
@Roel, thanks for the reply, but I'm not using serial midi, so my problem wasn't related.

Hi Rien,
I'm trying to use your script, but the access to your repository is not available.
The url returns a 404: The page could not be found or you don't have permission to view it.