On Sun, Sep 25, 2011 at 10:01 PM, David Robillard <[email protected]> wrote: > 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...
Hi David, Could you let me know where in Omins it is? I can port this for you... One plugin to create won't kill me (and I start to enjoy it anyway!) Aurélien _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
