amsynth 1.6.4-1 (i386 binary) in ubuntu bionic

 amSynth features:
    * two analogue-style audio oscillators, featuring:
          o sine wave
          o saw/triangle wave with adjustable shape
          o square/pulse wave with adjustable pulsewidth
          o noise generation
          o "random" wave (noise with sample & hold)
          o oscillator sync
          o of course, detune and range control
    * mixer section with ring modulation
    * analogue-style low-pass filter
          o 24dB/octave curve
          o dedicated ADSR envelope
          o cutoff and resonance control
          o keyboard pitch tracking
    * amplifier with dedicated ADSR envelope
    * modulation LFO
          o up to 58Hz modulation
          o routable to all sections (pitch, filter, amplifier)
    * Effects
          o High quality stereo reverb (freeverb)
          o Distortion/crunch
    * Easy navigation and manipulation of presets
    * Stand-alone OSS or ALSA Midi/Audio client