This is the Deep-Mono, a free monophonic single oscillator synthesizer VSTi from SonicXTC.
It’s a gem, this here synth. A bunch of vintage sounds, and of course, limitless possibilities.
“Our new VST 2.4 freeware monophonic single oscillator synthesizer, Deep-Mono, is a powerful synth that packs a punch. If you are a tweaker then you will like this synth. It is simple to program and has all the best synth programming parameters available right on the front panel. No endless windows or sub menus here. Just tweak a knob and you immediately begin to sculpt the sound. Comes with 70 presets to get you started but like the old analog synths of the 70’s it can produce an almost limitless palette of sounds.”
∙ 128 user presets
∙ 70 custom presets
∙ Midi automation
∙ Doppler Chorus
∙ Stereo Echo effect
Available for Windows.