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Nice design Frank.   Here are my 1% suggestions for improvements.

- Many resistors that affect gain. Choose 0.1% tolerance if possible , or adjust R4 accordingly.

- C3 has some AC voltage drop @ 5kHz can could be increased x10.

- V(ctrl) has enough ripple to cause +/-2% amplitude and phase error.

    - modified & added LPF to support low f range.

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