Isaiah Horowitz

So to contribute to these contrasts, there is one more.

The Mishnah Berurah siman kuf, lamd alef, sif katan tes brings from the Shelah Hakadosh, and this is what the Siddurim bring down is the proper custom.

We say, "Vaanachnu lo nada" while sitting, "ma naaseh" while standing.

So first we fall on our arm vayomer David El Gad, and then we sit up Shomer Yisrael, and then vaaanachnu lo nada we say sitting up, but ma naaseh we say standing up, the two of them both out loud.