linuxaudio.org

>1. Audio in/out ports. These are just blocks of samples, same

quoted text
>   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

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