On Sun, 2011-09-25 at 14:28 +0100, Aurélien Leblond wrote: > >1. Audio in/out ports. These are just blocks of samples, same > > as e.g. Jack buffers. Some call this 'PCM' but that is a > > misnomer. > > > >2. Control in/out ports. These are technically identical to > > audio ports (full sample rate), but the signals carried > > on them are normally not meant to be audio. How they are > > interpreted depends on the module and the particular port. > > Frequency control inputs can be linear or log, in the latter > > case that means 1/octave. Gain controls can be linear or log, > > there is AFAIK no fixed conversion factor for the latter. For > > example the VCA module uses 80dB/1 in exponential mode, but > > other gain controls may be different. > > > > Control ports are audio rate, but most modules/plugins subsample > > some or most of them. They either just use the first value in a > > block, or recompute internal paramters based on the last value > > in a block and then interpolate them linearly. > > > > Since control signals are (at least officially) at audio rate, > > LADPSPA plugins designed to be used in AMS (e.g. mine) will > > declare their control inputs as audio inputs. > > Thanks, I think it makes things way clearer! > What's confusing me so far is that I ported the VCO2 module, but with > exactly the same setup, the VCO2 LV2 in Ingen sounds out of tune > compared to the one in AMS. I thought it was due to some kind of > needed convertion, but maybe I'll go back to my code to double check I > didn't make any mistakes!
The note builtin in Ingen uses Hz for frequency. Anything else is completely insane :) There is a converter plugin in 'omins' which I need to port to LV2 as well one of these days... -dr _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
