I love the Harmonic Oscillator for its organic sound. I am looking for something that could complement my OP-1 and Peak soundwise. As far as I know the E352 Cloud Terrarium should fit the bill quite good. So it would be my first priority. Combined with the Belgrad I imagine wonderful worlds of hybrid drones and moving textures. As third VCO i am looking at a Klavis Twin Wave, especially for its digital "dirt". What do you think?