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preenfm2 and preenfm3 / Re: Which parameters on DX7?
« on: June 13, 2016, 02:41:14 AM »
Hi,
first post here, just wanted to comment on the DX/fm conventions:
frequency ratio means the same thing on both systems.
the DX envelopes are logarithmic, so their values are a bit tricky to translate
modulation index vs DX operator level -> this is weird to translate as well!
IM of around 13 = op level 99 in DX, IM of 1 = op level 65 in DX
(DX uses op level so that the algo does not matter, usability decision?)
EDIT: Added image
Other tidbits IIRC
Yamaha DX uses lookup tables, the puny cpus didn't have enough grunt to calculate stuff in real time
Chowing claims yamaha DXs operate @60kHz ie. up to 30kHz signals without aliasing
PS looking forward to grabbing a preenFM2 in the very near future!
Cheers
first post here, just wanted to comment on the DX/fm conventions:
frequency ratio means the same thing on both systems.
the DX envelopes are logarithmic, so their values are a bit tricky to translate
modulation index vs DX operator level -> this is weird to translate as well!
IM of around 13 = op level 99 in DX, IM of 1 = op level 65 in DX
(DX uses op level so that the algo does not matter, usability decision?)
EDIT: Added image
Other tidbits IIRC
Yamaha DX uses lookup tables, the puny cpus didn't have enough grunt to calculate stuff in real time
Chowing claims yamaha DXs operate @60kHz ie. up to 30kHz signals without aliasing
PS looking forward to grabbing a preenFM2 in the very near future!
Cheers