It may be a soft synth issue but I'm not sure exactly what you're hearing (or not) should I say.
I can audition notes in a drum map from the drum map manager if the note is assigned to hardware but not a softsynth, neither SD3 or TTS-1.
However if I select a clip and audition that then it does audition as expected, both hardware and softsynths hits.
To conclude the bug seems to relate to auditioning a row within the drum map manager and only if it's assigned to a soft synth.