V-vocal threshold question

I have the same issue with V-Vocal. Even on clips with plenty of gain, it does not map all notes.  I have to boost the gain way up, bounce the clip, then V-Vocal maps all the notes.  Clearly this is messy, and alters the mix of the clip relative to clips around it.
 
Bitflipper mentioned V-Vocal has a "gate" and will not recognize notes below a given threshold.  Does anybody know the threshold?  And can this threshold be adjusted?  That would make V-Vocal a lot more useful.
 

There is no user-accessible adjustment, AFAIK. Furthermore, the threshold depends on the material. For example, you can run a sine wave into V-Vocal and it will have no problem distinguishing the fundamental frequency even at -30db. An actual vocal clip might need to be -12db for V-V to reliably analyze it. If there is no strong fundamental at all, perhaps because the performance is very breathy, contains a lot of shouts and grunts, is pre-effected with chorus/delay/reverb, or a stereo track with large L-R differences, V-V may skip over large portions of the clip even though the amplitude is otherwise plenty high enough.
 
But try raising the level first. Rather than bouncing, use the more convenient Process -> Audio -> Gain to bring it up. Beware that if the problem isn't just level, but rather that the vocal clip is dirty, you may want to just re-track the part or punch in those couple of notes instead because even though V-V gave you a pitch line it may be mistaken or confused to the point where artifacts will be introduced.

Looks like in X2 (which I've recently switched to) the path has changed to Process -> Apply Effect -> Gain.  This is what I've always done in the past and then I'll use a clip volume envelope to bring it back down however many db I have to bring it up.  I guess that's what I'm going to be doing. 
 
On a single track it's not so bad, but in this case, I have to match up 2 violin takes and a sax take playing some exposed unison lines.  Each take was recorded with multiple mics that are blended to get the right tone and there are random notes here and there throughout the song where the players just weren't quite close enough.  With this v-vocal is detecting on some tracks of the take, but not on others - a close mic vs a room mic for example.  A threshold adjustment would make the process a lot faster.  Oh well....