[sdiy] Sblive AUD_EXT

[Linium]

Le Lundi 30 Septembre 2002 14:06, vous avez écrit :
> I think the GP outs are GP (general purpose) outs, you set a bit in a
> register and read value 5V or 0V in this pin (assuming TTL level).
>
> Anyway, I have also been thinking the same with S/PDIF. It would be ideal
> if you could write a VST plugin and do the MIDI -> CV/gate conversion
> there. Unfortunately only floating point data is used with VST, though you
> maybe could access the sound card with the S/PDIF from the plugin via
> DirectSound and use integer format. Maybe the code could be in another
> process and your plugin just sends the changed data there some other way
> (shared memory, MIDI, IPC, RPC, Corba, COM name it).
>
> -Mikko

Yes there are said as "general purpose" outs, i forgot to mention that in my 
previous post. On the other hand it doesn't bring any extra clarity, at 
least for me ;), so may be that's why i didn't add this precision.
But it seems that "general purpose" outs are meaning something for you.
It is a start :) The sblive has several pins on this connector and despite i 
have the name of them it's not clear in what format binary datas are sent.
I know there are several spdif outs and several I2s outs and theses famous GP 
outs. There are various clocks and frame signals too.

Here is the details:

http://w1.910.telia.com/~u91003452/live/images/PinoutDrawings.gif

As you see spdif/I2s and GP outs are labelled simillary so we can think that 
the same audio channels are "outed" in different formats.

I have a little AVR MCU i could use to figure out how datas are organized.
But i don't know yet what clock to use, and it will take a little time.

Concerning the idea of a VST plugin i have no peculiar insight. 
All depends what you want really. As far as i am concerned i use PureData 
which is a free (source code and usage) program that can handle midi and 
audio. It runs on windoz and linux. It is very easy to connect a sequencer 
using the Hubi's midi loopback tool to PD which run in back ground.
Each note received can trigger some software modulators of your own. (it is 
very easy to learn and program).
And you have all latitude to send the corresponding audio signals you want to 
the soundcard.
In our case the audio signals sent go to one of the digital stereo outs of 
the SBlive and a MCU is there to spread the info to DACs or a multiplexed DAC.

But you could use theorically any softsynthesizer you want. It just has to 
allow you to multiplex the outed signals ( if not you have only 2 outs).

Thx for reading,

Linium