I'm experiencing the same sound problems. In previous models, the HD500/500x and Pod HD Bean pedals were not polyphonic, but there was no confusion when soloing with a single string. When you adjust the Pitch of the Helix it will result in low noise mixing even if you don't press the other strings. This situation made me sad. I bought it expecting this feature to be better in the new pedal released by Line6, but the old pedal is better now.
Please give an update on this. This will make Helix invincible.