Mapfactor ignoring custom warning sounds ...

Higuys,

I´ce created some more subtle warning sounds for Mapfactor, but they are just ignored. I examinated the original ones with mediainfo which showed me:

=====================================================================

Format                                   : Wave
Dateigröße                             : 43,7 KiB
Dauer                                    : 1s 0 ms
Modus der Gesamtbitrate                  : konstant
Gesamte Bitrate                          : 358 kb/s
Kodiert von                              : RDM2000
Aufnahmedatum                            : 2009-04-26
Kodierendes Programm                     : Sound Forge 4.5;Sony Sound Forge Audio Studio 9.0

Audio
Format                                   : PCM
Format-Einstellungen                     : Little / Signed
Codec-ID                                 : 1
Dauer                                    : 1s 0 ms
Bitraten-Modus                           : konstant
Bitrate                                  : 352,8 kb/s
Kanäle                                   : 1 Kanal
Samplingrate                             : 22,05 kHz
Bit depth                                : 16 bits
Stream-Größe                             : 43,1 KiB (99%)

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for the files scout_100, scout_500 and scout_1000.wav. Scout_default is the same format but only exactly 500ms long.

Using this data (incl. meta data) I created new custom files, but during navigation or route simulation they are simply ignored at positions where the original warning sounds are played back, no strange sounds or something similar, simply nothing.

Rechecking and comparing the original/custom files with mediainfo results in exactly the same format as the original files (see above), files were created with WaveLab.

Any suggestions for a suitable solution...?