If you want dynamic control, you need to re-create the X3 architecture in a modern VST. The X3 is an "AI²" synth: 2 oscillators (Multisound PCM + 6-op FM), a resonant low-pass filter (12/24dB), 2 EGs, and 2 LFOs.
: The "X-Files 3300" expansion is a massive 73GB multi-sampled library that captures original X3 patches with velocity layers and remastered loops.