Problem playing very short WAV files

Hi, I'm trying to use MOC as a sample browser, unfortunately very short WAV files, like percussion hits, just create a kind of dull click sound - longer samples seem to work fine. I'm running Arch and installed MOC via pacman and copied the example config specifying ALSA as the only driver. I know ALSA is working correctly, using "aplay sample.wav" plays the WAV correctly.

Any ideas would be greatly appreciated.

Thanks, Paul