MOTM

>To use the Tau pipe phaser board with the Subtle chorus main
>board, you wrote that we need to "omit some components". Is it
>possible to build Tau boards so that they can be used standalone
>or slaved to a main board, depending on normalling jacks and/or
>switches ?

Yes, and you don't have to omit any components.
Basically, you just run two Tau Boards without resonance and without wet/dry 
mix (i. e. in Vibrato mode) and connect this to the Main Board (where th 
efiltering and cross-mixing takes place).
It will even be possible to make a send-return loop in a Dim D version, and 
connect two external standalone Tau boxes.


>(If that matters, I don't need balanced I/O. My setup is almost
>entirely unbalanced anyway.)

Same here. And I don't really need to drive 600 Ohms either.
Just bring out the noninverted outputs to 1/4" jacks and leave the inverted 
outputs unconnected.
(That's what I'm currently building in my prototype.)

JH.