The fast stuff in the Czardas video is 100% fake.
This is a revealing passage: Start at 2:42, use head phones and pay close attention to the sudden change in timbre, intonation, and articulation. At 2:43 - 2:45 we hear a real double bass with its characteristic thick attack and the intonation imperfections you would expect when playing a very fast scale by on one string, but at 2:46 - 2:51 the fast one-string arpeggio runs are clearly played by a MIDI sequencer. Here the attacks are crystal clear and every single note is in perfect pitch, at the same time as the timbre is very artificial.
All this becomes even more apparent at 0.5x playback speed.
This is a revealing passage: Start at 2:42, use head phones and pay close attention to the sudden change in timbre, intonation, and articulation. At 2:43 - 2:45 we hear a real double bass with its characteristic thick attack and the intonation imperfections you would expect when playing a very fast scale by on one string, but at 2:46 - 2:51 the fast one-string arpeggio runs are clearly played by a MIDI sequencer. Here the attacks are crystal clear and every single note is in perfect pitch, at the same time as the timbre is very artificial.
All this becomes even more apparent at 0.5x playback speed.
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