something must be off...my tone control is definitely noticeable when engaged. When I flick the switch towards me as I'm in front of the amp, the tone knob is engaged and when I turn it clockwise, I hear it's effects more and more. A gentle smoothing of the top frequencies...

Play around with it some more, then give a call to the Decware folks to have them help you figure it out

I, too have a hard time discerning (remembering) what position on that switch is ON and then whether the knob turned clockwise or counterclockwise reduces the treble. You have to be in front of the unit with material that has high frequency to tell.

That's interesting. On my Torii Mk II and Mk III I can clearly, easily hear the treble reduction and I thank my lucky stars every day that I have this circuit in the amps! Same was true of my Integrated when i had that in use.

The other thing to try out is ask a female to listen and see if she can hear a difference. By nature I think they can hear higher frequencies. Found that out by doing a frequency sweep on a new pair of speakers I built. Dogs were howling and she came in yelling at me to stop what I was doing because it hurt her ears. She can hear 22K.  :)

This posting is in reply to my original posting on this thread, and to all those who were kind enough to reply.

This morning, for the first time, I clearly heard how the Mini Tori softens the top end frequencies.  It's all a matter of what recording you are listening to.  I couldn't hear any effect of the treble control on my various CDs, but this morning I played a vinyl recording of Respighi's "Pines of Rome" conducted by Bernstein on Columbia.  There is a lot of shrill high end on this recording.  So I adjusted the treble, from one extreme to the other, and could clearly hear the difference at the top end.  And just for clarification, activation of the treble control occurs with the little switch pulled towards the front of the unit.

Thanks for your comments, all.

-Dennis Webb