synthv1 is an old-school all-digital 4-oscillator subtractive polyphonic
synthesizer with stereo fx.

Features:
* a pure stand-alone JACK client with JACK-session, NSM (Non Session management)
  and both JACK MIDI and ALSA MIDI input support;
* a LV2 instrument plug-in.

WWW: https://synthv1.sourceforge.io/