Distribution Amp - How to switch off buffers independently?

[markolexus]

Hi folk,

I'm looking to build a distribution amplifier along the lines in this circuit. One stereo input to six or even eight outputs. (Not looking for much gain - just no loss of course.)

Much credit to Brion55 for this here .

Then I thought it would be nice if the output buffers could be manually switched on and off independently - and led indicators would show which were in use.

Is there a simple and not too costly way of doing this?

And does anyone know what sort of rating (VA) would the power transformer need to be? Because that might make the difference between a 1U and a 2U case.

Many thanks in advance.