Something just occurred to me...
What I'm talking about here is functionally identical to Dim Solo, except that the level of each non-soloed audio track is -inf dB. In Dim Solo mode, MIDI tracks are not muted AFAICT, yet all other solo logic is applied to audio tracks, but instead of muting, the level is reduced.
Before posting this thread I went to the Dim Solo settings hoping that I can simply enter -100dB or something for the Dim Solo Gain, but we can only go down to -18dB. If we can enter -100dB or something similar, we can have glitch-free soloing.
Noel, is there any chance we can get a Dim Solo Gain range that allows for any arbitrary user entered value? It seems like a really easy way to get glitch-free soloing.
EDIT: I played around with Dim Solo a bit, but surprisingly the MIDI still seems to glitch. So when enabling Dim Solo and soling an audio track, other VSTis temporarily get their MIDI interrupted after which they then start playing back again at the reduced level. It appears the current implementation isn't seamless.