The new version is much improved in the matter of EG timing ro the original. One day it will be perfect.’
https://asb2m10.github.io/dexed/
Comparing Dexed VST virtual Yamaha DX7 FM Synthersizer and the real thing. The reak DX7 had a ~14khz Sallen-Key low-pass filter to scrape off the HF DAC noise. The emulation of the Dexed mkI setting does not implement the filter where as the ‘modern’ 24bit engine does not display the signal >= 14k. So in this respect Dexed .9.4 mkI setting is ‘dirtier’ than the real DX7. Using the OPL3 engine setting there was a raging party going on from ~15k onwards,.
No filtering of DAC noise.
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Using 24bit ‘modern DAC engine’
Of course you can always roll your own favorite filter EQ on the bus or eat the dirt. (I can’t hear anything much over 8k anyway)