jambient can read wave files encoded in PCM format. It supports stereo or mono samples, at any of the standard sample rates and bits per sample settings. If you are planning to make heavy use of your samples with jambient's 3d spatialization feature, you should convert them to mono to improve performance, since DirectSound needs to convert stereo samples back to mono before rendering them in 3d. Some wave files are not encoded using PCM, and jambient cannot read them. You can convert these files to PCM using an editor such as WaveLab or a converter such as Awave.