MXR envelope follower..?how works?

[KA4HJH]

>I don't have the Baseballs ckt to hand, but the Dr Q envelope filter has
>a half wave rectifier controlling a transistor in a strange filter config
>(at least, strange to me.... but, since there are 2 obvious errors in the
>ckt I have, maybe it isn't really THAT strange!)

You don't happen to have the Dr. Q circuit to hand, do you? Mine's dead.

Terry Bowman, KA4HJH
"The Mac Doctor"