Yes, every clip is coming from a different synth. I can hear the differences if I listen to the clips with my headphones and try to concentrate on how the low frequencies play, are the highs smooth or not and how the filter sweeps (yeah I know it's very difficult because there's no resonance). It's also very hard to tell from these pure waveforms. If I had used more than 1 oscillator, there would be more difference.
