phasex binary package in Ubuntu Bionic amd64

 PHASEX is an experimental JACK audio / ALSA MIDI softsynth for Linux
 with a synth engine built around flexible phase modulation and
 flexible oscillator/LFO sourcing.
 .
 Modulations include AM, FM, offset PM, and wave select.
 PHASEX comes equipped with a 12db/octave filter with two distortion
 curves, a stereo crossover delay and chorus with phaser, ADSR envelopes
 for amplifier and filter, realtime audio input processing capabilities,
 velocity/aftertouch sensitivity, and more.

Source package