Tendencies of Sound Changes?

Hello,

Some time ago, I saw someone here mentioning that it's more
likely for a voiced stop to devoice than for a unvoiced stop
to voice. I know that in the realms of sound changes,
basically everything is possible, but I wanted to ask if
there are more rules like that? I already know that stops
tend to be come affricates tend to become fricatives etc.
and that this mechanism also works the other way round.

Thanks for information,
Carsten

--
"Miranayam cepauarà naranoaris."
(Calvin nay Hobbes)

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