audio-dvd-creator does not creat DVD-Audio discs, but rather, it creates DVD-Video discs. the DVD-Videa spec is limited to either 48kHz or 96kHz. if you want to use 44.1 audio, you need to either resample to 48, or creat an actual DVD-Audio disc.
my website lists all the programs to use for DVD-Audio (
http://24bit.turtleside.com/), including Scott Brown's free GUI. that's what I would recommend.
Of course, you also need to make sure that your player will play DVD-Audio discs.