In my little jazz/blues eclectic trio I have no problem hearing my violin and the vocals and bass, and making it all work together.  In my 7 piece oldies rock and roll band though, especially due to the drums, the volume level gets pretty high. I have a Rolls PM351 that I run my own monitor amp through so i can adjust the level of the monitor mix and my own instrument with that (So I can get "More Me" in my own monitor with a twist of a dial).

Doing the Doobie brothers "Black Water" in a loud practice session it all sounds pretty good to me during the rehearsal, but...  I recorded the session with a multi-track recorder from of the mixer insert channels, and I have a lot of intonation errors on the viola part.  Even though it sounded much better to me live.  I can play back the balance of the band at low volume and play along with that, and the intonation is better (but not perfect;  i'm no Novi Novog). 

Do any of you have experience or advice playing in loud orchestral or band environments? Maybe their is just a volume threshold where my pitch perception is overloaded so i will need to go to a lower volume in ear monitor, even though those have their own issues.   (By the way, this is one of the reasons Mark Wood says he made fretted Viper violins, so that the violin player could have good intonation even if the on-stage sound level was too high, but I would rather continue with a fretless/traditional violin.   Thanks.  gws