From the Daily Halacha emails which appear in my inbox:

> 966. One should be mindful to carefully pronounce each word when responding "Boruch Hu U'voruch Shemo", and be especially vigilant to pronounce the letter "Vuv" of U'voruch. Piskei Tshuvos 124:11, Kaf Hachaim 124:29, Boruch She'omar

I didn't understand this well. There are two vavs in "Uvaruch", and I don't know which one it refers to or why one has to be especially vigilant to pronounce either one of them.

I tried to "nachgeschau". I don't know a book called Piskei Teshuvot and neither does hebrewbooks.org. It has four called Baruch She'Amar, and with no page or chapter reference I don't know where to begin looking.

The Kaf Hachaim I do have, and it says something rather different which makes much more sense LAD:  "velo keminhag rabbim me`amei ha'aretz she'omrim 'Baruchu uvaru shemo' ki ein ze mevarech".

Can anyone provide a source and/or a reason for the halacha as stated in the Daily Halacha?