post and link.Even the korg's legacy collection sounds real crappy inside the computer, but when its played from oasys, it has some 'warmth' added due to hardware circuitry. My PreenFM for example has loads of aliasing which gives it this sharp edge moreso than your average Yammy FM.
I own/owned many FM synths over the years, aliasing is really audible in the older gear. Hence it's quite rough in the maths where sin accuracy (phase) functions are quite audible. In the YMF262 OP元 case (kinda of a single chip child of the 81z 4-op) it uses fixed integer lookup tables for not only frequency divisions but also for sinusoid calcs. You're right that the FM chip is waaay too slow to do even 16-bit floating point calculations on the fly. I'm pretty sure the DX7 is like the OPLx series that have been extensively reverse engnieered for very precise emulation. Also I used to have one of the original brownie DX7, might be the 12-bit DAC but it sounds quite different than say a 81z on top of having a high noise floor.Ĭheck it out, someone completely de-encapsulated a OP元 and reversed it: My PreenFM for example has loads of aliasing which gives it this sharp edgy grit moreso than your average Yammy FM. Quite ingenious, its all just lookup tables, very fast response w/ no real cpu interaction.
That's why FM8 sounds "cleaner" and not as "grungy" - it has more precise calculations.This. DX7 had limited CPU power and I would think that samples in it weren't calculated as 32 or 64-bit floats, which is what FM8 is doing. Now, it depends on the calculator which does that math.
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