Self-patching bela?

WelchRedneck

Hi all, I'm trying a project using the pink trombone example. While this was originally designed for salt I'm trying it out standalone with just some potentiometers wired to bela.

The pink trombone example requires that the oscillator be patched to the filter. Can I wire bela's audio out directly to its audio in to achieve this? should I use a voltage divider? buffer? current limiting resistor?

giuliomoro

Wiring them directly is fine (they are inputs and outputs from the same codec), or you can just amend the code so that you don't need to do that :-)

Replacing

AudioSystem->doScriptProcessor(inputArray, glottalOutArray, tractOutArray, gLength);

with

AudioSystem->doScriptProcessor(glottalOutArray, glottalOutArray, tractOutArray, gLength);

should to

WelchRedneck

Thanks for the reply! The project in question is going to have a patchbay for aesthetic reasons I think, so we'll wire the signals externally. We're going to try and generate some LFO's using the analog output pins, so same question, can these be patched back into the analog inputs? in terms of voltage levels?

giuliomoro

WelchRedneck can these be patched back into the analog inputs? in terms of voltage levels?

See the voltage levels table here. It's safe to plug the analog out into the analog inputs, but the top 20% of the range will be chopped off. Because the output range is 0V:5V and the input range is 0V:4.096. in your code you should use output values between 0 and 4.096/5 (i.e.: 0.8192) for these to be mapped to input values in the range 0 to 1.