Holy sh*t this is cool! Wish I had enough time to f*** around on this thing all day..damn I curse a lot..
FL Studio’s SynthMaker is an audio programming tool for Windows that lets you create your own sounds, virtual instruments and effects, without having to write any code. The instruments and effects you create can then be used for playing live via MIDI or as VST plugins.
Image Line put together this Synthmaker tutorial that looks at how to make a 2 oscillator synth.