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The important part of my circuit is the transformer because this is doing the input CMR and re-balancing the output. To insert another stage with a pot will bugger this up. Also, to gain first then attenuate will reduce input headroom by the amount of the extra gain. If the feedback resistors are switched using a make before break switch, then it would be possible to vary the gain without disturbing the CMR. However I think only a 10 db range would be sufficent.
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