> I read on Muffs that you can upgrade the A119 by changing the chip,
> but results seem to vary.

AFAIK the A-119 uses a TL062 which is optimized for low power
consumption.
There are different alternatives with different specs therefore it no
surprise that results vary. ;)
E.g. you can use a cheap TL072 which sounds slightly better.

But: If you want a real good sound you may also try a good external
preamp.

I myself just changed swapped the TL062 for a TL072 and am ok with it
as I process the
signal anyway and rather drastically. But I also never heard any
'dullness' and my A-119
distorts only when I want it to.

Can anyone make audio files were they 'dullness' or distortion of a
A-119 can be heard in comparison
with the original signal
The 'dullness' in an A/B comparison may be the result of one of the
signals being quieter.

Joachim