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Originally Posted by DarkEcho  I am using the apogee duet, so the specs for that should be what governs my relationship between dbfs and 0dbvu right? |
Yes.
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Originally Posted by DarkEcho I get the point that since analogue and digital react differently that the whole formula exists on the first place.. I still don't really get why we have this concept in the first place... |
analog and digital don't react differently. The meters we use react differently.
A VU meter measures the average level of the signal. This corresponds to how we hear the loudness of the sound.
A digital meter measures the peak level of the signal. This is used because there is a hard ceiling on how much signal can be represented digitally.
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Originally Posted by DarkEcho What is optimal analogue level and What happens at 0dBVU? |
0VU or 'line level' is the optimal level. That is the level that the equipment was designed to run. That is where there is the best signal to noise and the lowest distortion.
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Originally Posted by DarkEcho The saw can handle anything up to 0dbfs no problem, but its my converter that's holding me back, right? |
The analog part of the converters and anything they are hooked to.
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Originally Posted by DarkEcho I do everything ITB with softsynths and no recorded audio yet, do I even need to care about this? |
The only thing you have to worry about is overloading the plugins. Any plugin that emulates hardware will distort (just like the hardware) when hit with a signal too hard. There is also the issue of all the tracks adding up and clipping the master buss.