I wasn't intentionally talking MIDI (I think) - just contemplating the possible effect of hard and soft pick attacks, via a string on voltage and, in turn, how that voltage difference would be translated by an FX processor (sweep, glide, etc.).

So - for example - you can have a high-pressure attack on a string with a pick, which might be translatable into a decay factor on a sweep or glide. But what would be the combined effect of hard attack and variable note cutoff. Hit a string with some force and leave it to ring - we imagine that the voltage increases with the volume - and the decay will be a function of the volume. But play the same note with a faster cutoff... what happens to the decay then? In other words, we don't just play with one constant (force), we also incorporate other dynamics which might muddy the waters...