Casio Computer Company Ltd.
The Casio FZ-1 is a sampler with a build-in synthesizer section. It has 61 keys and the sampling section is a little bit low powered compared with modern instruments. But when it hit the market in 1987 it was a big competitor for other companies.
Usage in Kitaro's music:
Kitaro uses it a lot in concerts. For example you can see him on the DVD Kojiki in Concert playing a flute part in "Sozo". Here is an audio excerpt from it (WMA file, 206 KB). You can hear the flute very well.
To hear on which album or to see on which DVD?