I'll check when I get home and look at my SBC and my Radio, but I still
think you're confusing the Replay Gain settings with the volume lock
settings. They are not the same thing at all. And if you're not locking
the Receiver's volume at 100% in LMS then you are almost certainly doing
it in www.mysqueezebox.com (or maybe both places). 

Use the Controller to set your Receiver to "No Volume Adjustment". Then
login to www.mysqueezebox.com and select the Players tab, then select
your Receiver on the left and the Audio tab. I'll betcha that your
setting for the Receiver is "Output level is fixed at 100%". 

Now select your Radio on the left, and you'll see there isn't any Audio
tab at all. That's because the newer "fat devices" (Radio and Touch) can
manage those settings on the player themselves. And for the Radio, it
just doesn't make any sense to lock the volume at 100%. Who would want
the volume at 100% with no way to turn it down via a remote control or
the knob on the front? That is why the Boom also does not have the
volume lock setting, even though it is a slim device.  It's not a design
error, but rather tailoring the options for what the player does.

I'm not 100% sure, but there may be an interaction between the replay
gain settings and the volume lock settings, because if volume is locked
at 100% and replay gain is enabled and you get +db then bad things can
happen. So maybe when you use the Controller to switch the replay gain
for the Receiver to something other than "No Volume Adjustment" it
un-does your volume lock setting, and then re-enables the volume lock
when you turn replay gain settings off. That is easy enough for you to
test.

I am reasonably sure that the "No Volume Adjustment" (ie, replay gain)
on your Radio does indeed do something, or at least is capable of doing
something, depending on the source material. It certainly does something
on my Radio. Specifically, it tells the Radio to ignore replay gain tags
in the music files it plays. And anything you listen to on
mysqueezebox.com is highly unlikely to have replay gain tags. So, it
"does nothing" in the sense that it tells the Radio to ignore something
that isn't there. But feed the Radio some music with some large-ish
replay gain values in the tags and switch between "No Volume Adjustment"
and "Track Gain" and you'll hear that it does indeed do something.

Finally, as for not wanting to adjust levels in the digital domain, it
is good to know that the Receiver and Radio output 24 bits, so if it is
regular 16-bit material you're listening to then reducing the digital
volume merely shaves off the "padding" zeroes that are filling out the
last 8 bits. So on 16-bit material you can decrease the digital volume
to 80% or even below without doing any damage to the signal. But if
despite that you still just don't want to adjust levels in the digital
domain, that's your business and your right.


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