I noticed that using Voicing III makes my DT very noisy (mainly with Treadplate Pre-amp modeling). I also noticed that setting "Negative Feedback" to anything else than "Zero" removes the noise while keeping the punch of the voicing. Unfortunately, I cannot tweak voicing "hidden parameters" using HD500 Edit software.
It would be great since I cannot use MIDI controler AND HD500 at the same time with my DT amp. It looks like when L6 Link is connected at the back ot the AMP, MIDI port become disabled and any MIDI message sent to the AMP is not processed.
I built my own IOS inteface to control both my DT amp and HD500 but only POD HD500 reacts to MIDI messages when both devices are in use...