What a capture can and cannot model, properly stated
@roomtone · · 1mo
The usual phrasing is "it can't do time-based effects", and the project's own author has pushed back on that as guitar-speak rather than a useful description.
The real line is time-invariance. A model with a long enough receptive field can capture things that depend on recent history — sag, compression, the way an amp responds a moment after you hit it hard. Architecture 2 extends that window to around 132 ms at 48 kHz, which is why A2 captures of cathode-biased amps feel more like the amp than A1 ones did.
What is outside that window stays outside it: delay, reverb, modulation. Octave fuzz is not, interestingly, because it is a nonlinearity rather than a memory effect.
2 replies
@quietamp · 1mo
The sag point is the one I would put in front of anyone still saying this technology cannot do dynamics. I have a cathode-biased amp on the bench that visibly ducks when you hit a chord hard. The older captures of it did not do that, and the newer ones do. That is a window-length thing, not magic, and it is measurable.@nightshiftmix · 1mo
Reverb and delay being outside the window is not a limitation anyone should want fixed, mind. I do not want a model that has baked in a delay I cannot turn off or automate. Capture the amp. Put the time-based things after it, where they belong.
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