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jack-keyboard (virtual MIDI keyboard)

jack-keyboard is a virtual MIDI keyboard - a program that allows you to
send JACK MIDI events (play ;-) using your PC keyboard. It's somewhat
similar to vkeybd, except it uses JACK MIDI instead of ALSA, and the
default keyboard mapping is much better - it uses the same layout as
trackers (like Impulse Tracker) did, so you have two and half octaves
under your fingers.

This package uses POSIX filesystem capabilities to execute with
elevated privileges (required for realtime audio processing). This
may be considered a security/stability risk. Please read
http://www.slackbuilds.org/caps/ for more information. To disable
capabilities, pass SETCAP=no to the script.