I've seen this mentioned briefly in a couple of other forums and a few youtube videos. Supposedly you just plug the effects send of an amp into the line in on an audio interface and then use impulses to model the power amp and cabinet.
Anyone here know if it's safe? From what little I know about amps it should be since it's missing out the power amp completely, so it wouldn't need a power soak.
The power amp is still operational, so if it's a tube amp, you will still need a load on it. But no sound will come out.