Sorry, I must have missed your earlier reply.
Its pretty much as sgrossklass has said really although I am a real fan of the OPA2604 its a great opamp for audio.
Another option based on sgrosslass's observations... you could also raise the 1k input resistor. Doing so would reduce the applied signal as the 1k and 30k form a divider.
Using the references from sgrossklass th gain is (R17/R18) + 1
So that works out to a gain of 4. The input attenuator as it stands (the 1k series feed, 30k to ground) has negligible effect.
You could just link R17 out as a trial. The OPA2604 is 'unity gain stable' and so it should be fine.