>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! By the way, the LADSPA plugins you are referring to, I suppose these are the MCP ones? Are you planning onto porting them to LV2 ones? Aurélien _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev