Tilt EQ - how to remove attenuation?

[fryingpan]

I'm implementing the following circuit in my design:



I really like the curve, since it's a gradual lift instead of being a simple shelf with rising frequency as you turn the gain boost up, and it only needs one opamp (well, two, since you need a very low impedance feeding into it). It's implemented as a treble boost only (and later, as a bass boost only).
The main drawback is that it attenuates as well as boost, which makes it wasteful in a design that is intended to be a guitar/bass overdrive with pre-emphasis and de-emphasis. Shaping the signal should result in *more* achievable distortion, not less (which would be the case with this design). Boosting the fullband signal before would easily result in full-band clipping on transients, considering that the meat of a guitar or bass signal is in the low mids and bass. The alternative is to use a fixed treble shelf, but I wanted pre-/de-emphasis to be variable and not fixed. Another alternative is to use a fixed treble shelf with two or three switchable paths to ground (say, +/- 6dB, 12dB, 18dB), which would be my compromise of choice.

[GibsonGM]

One thing I'd suggest is searching for an active tilt control on the net that incorporates a buffered input with, possibly, a gain recovery stage - and these problems will have already been solved    There are tons of good ones out there!  No need to re-invent the wheel (IMO)...the 'attenuation' will already have been accounted for.

[ElectricDruid]

You get boost *and* cut because the feedback is referenced against that input. Otherwise it's a normal non-inverting op-amp.

Move the input to the positive input and take the current input to Vref instead and you'll turn it into a non-inverting amp that only has gain, but the gain is dependent on frequency. The flat centre position finishes up providing x2/+6dB gain.