בַּאֲמִירַת תְּהִלִּים (פז. ז)

In the phrase kol mayanai bach (Tehillim 87:7), [the word כל may be vocalized in either of two ways].

אוֹמְרִים כָּל מַעְיָנַי הַכָּ"ף בְּקָמַץ

When one is reading Tehillim, this word should be pronounced as vocalized with a kamatz; 

בְּסֵדֶר בִּרְכַּת הַמָּזוֹן — הַכָּ"ף בְּחוֹלָם

when it appears in [the readings that precede] the Grace after Meals, it should be pronounced as vocalized with a cholam.

Text and Translation courtesy of Sichos in English

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