This is the tough part. The mids are very clearly there in the Helix, as well as the highs and lows of course, but there's something about the difference in tonal nature between the two devices' mids that are the difference, not the quantity. The Helix has plenty of punch and body, but it also sounds like there's a good deal of harmonic content that is missing in those same ranges. If I had to pick a single phrase to describe the difference in tone between the Amplifierbox and the Helix, I'd say that the Helix retains less of the sound of the physical strings. Almost as if the acoustic properties of the instrument, however minor they might be, are filtered out far more in the Helix than in any other modelers I've tried, with the exception of Positive Grid's offerings. Amplifire, as well as S-Gear and Mercurial's Spark, do not exhibit this same flaw. It might seem like a strange description to give, but that the best way that I've found of putting it.