synthv1 (an old-school polyphonic synthesizer) synthv1 is an an old-school 4-oscillator subtractive polyphonic synthesizer with stereo fx. It runs either as a standalone JACK application or an LV2 instrument plugin. Optional dependency: The LV2 instrument plugin requires lv2 to be installed (auto-detected at compile time). 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.