On Wednesday, July 19, 2017 17:25:50 Andreas Persson wrote: > I fine tuned the sfz EG and modeled it after SFZ Player and Rapture > 2010-01-30. So, that the attack is linear and the decay and release are > exponential are deliberate (didn't even the original sfz spec say that > it should be like that? I don't remember).
Most EG implementations use linear for rising stages (i.e. attack) and logarithmic curves for falling stages (i.e. decay, release). That has historical reasons, since the first EGs based on analogue circuits with their simple RC components behaved like that. > For exponentials the > interpretation of time values is hard as it depends on how close to the > target level you count as finished, but I tried to make the calculation > as close as possible to the SFZ Player/Rapture behavior. Yes, that's in general the problem with logarithmic stages. To make this more clear: Since i.e. a logarithmic release stage will fall down towards zero with constantly reduced speed, it never reaches zero level. So which EG level do you then consider as end of the release stage? -12 dB? -24 dB? -120 dB? In the end we must pick one level to be the "end" level. And accordingly depending on which end level we pick, the duration is different to EG implementations of other players which have picked another EG level as "end" level. Since sfz is highly configurable and extensible, maybe somebody already suggested an opcode for setting a specific "end" level. CU Christian ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Linuxsampler-devel mailing list Linuxsampler-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxsampler-devel
