Hi Junichi, thanks for your interest. Yes. * Shelljam is designed from the ground up to be a full-fledged musical instrument that can be used for professional live performance. -Safe, locks keyboard -Uses a compiled language -Performance is measured as latency and jitter * Shelljam is portable, flexible and extensible -The I/O library supports, additionally to the keyboard under X, console keyboards, mice, joysticks, touchscreens, Sharp Zaurus and iPaq input, and all PC operating systems. -The MIDI library supports all PC operating systems -Instruments can be created as run-time libraries * Shelljam has bold plans for the future: -Create a tool that can be used by a whole movement of kids, designed from the ground up to use the computers they have in their homes as full-fledged, highly tuned musical instruments. -Shelljam will support not only keyboards but mice, joysticks, and linux handheld devices to make music in genuinely new ways -The author intends to make a living by being a singer/computer peripheral player Shelljam has a slightly higher learning curve and currently the UI looks like you just crashed your computer so if you just want to test your synth by all means use vkeybd. Carlo