> There's also the limitation that the preset threshold voltage of the
> A150 is 3.6V, so nothing south of 3.6V would throw the switch
> without a boost

Another job for the A136!

> and anything over 3.6V would need attenuation. Getting the
> effect fine-tuned would be finicky.

Cheapest dual attenuator would be an A132 controlled by an A176, which
gives you fine adjustment into the bargain!

Joe