Keanu's music keyboard - what type, model, etc

Does anyone know the make and model of the sampling keyboard that Keanu used to record the sound the grinder was making? He had a microphone plugged into it and recorded the sound then played it back on one of the keys near middle C.
BTW, many of the main actors in this movie's police force (as well as Joanna Cassidy) also appeared in the movie The Package.
Any help with this keyboard would be greatly appreciated.
Thanks.