OK - I think I know what causes this:
The Virus TI has certain parameters that have been programmed to only change once a new voice is played. This is to avoid unwanted artefacts in the sound. Specifically, these are
Delay Patterns
Reverb Room Types
Oscillator modes.
Since these are not 'performance' parameters, realtime control is not normally required.
However, once you have changed one of these parameters without triggering a new voice, the sound will stop responding to any other controllers as well, it seems.
I guess for now, the answer would be to avoid changing these parameter values on sustained voices, if you wish to do lengthy, live tweaks to a note/chord, or simply remember to retrigger the notes if you change these parameters.
I suspect that in most cases, in this situation, you will be messing about with a patch, experimenting with all sorts of different parameters, as opposed to actually performing something?
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