In DX7 the actual sound was made with custom LSIs. I.e. there is no CPU involved. And no multiplication inside, Japanese engineers used log/exp sine tables instead. Also DX7 had sampling rate of 49096 Hz, 12-bit "floating-point" DACs etc etc. Most of software versions of DX7 don't take these nuances in account which makes some DX7 purists upset :)
If you, as a DX7 clone developer, want to make happy these 2 or 3 people too, please, use fixed point calculations, resampling, real ROM data and so on :)
If you, as a DX7 clone developer, want to make happy these 2 or 3 people too, please, use fixed point calculations, resampling, real ROM data and so on :)