the higher notes are brighter on a piano, so sending an attenuated copy of the pitch cv to open up a filter is common technique when synthesising piano like sounds (often called key tracking or key follower on analog synths). also, having a separate oscillator with more complex harmonic qualities, with a shorter (short!) decay/release time to imitate the hammer hitting the string is a good idea. experiment with blending different waveforms to achieve the right harmonics.

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