C-Audio SR-707 Protect Issue

The final issue i had is pretty much solved

i simply increased the input level.

I have 3 settings on my soundcard 

using a 1khz sine wave  at 0.1db from the software altering the attenuation options (small relays on the card i think)

the multimeter readings i can have are:

1. .39v ,  loud output.

2. 1.12v  potentially very loud as one would expect  (no distortion)

3. 2.27v  would be very very loud if i turned it  up (with 2.27v sine wave input and the main volume dial just slightly up I can hear a very slight distortion, I presume this is from the tl071 opamp struggling with the input level)

so that's pretty cool! 

Thank you to all that helped. especially simonp1100 : )