[BC] Disguising callers voices

[Kevin Tekel]

Jim Offerdahl wrote:
> Anyone have any ideas on how to build a box or where one might be bought
> that would alter a caller's voice in a way like the you see them do on
> TV when they have someone on who wants their identity hidden?

Just ask them to call through an old-fashioned landline phone with a carbon microphone element (the classic "salt and pepper shaker" handset).  That naturally distorts the voice enough that radio DJs often use one to distort and disguise their *own* voice while making prank calls, or when having someone in the studio call in to the show and act as a make-believe caller.