Siddur: Ashrei in Depth Part 3 (First and Last Pesukim), Yishtabach Part 1

Last two and first two pesukim, and on to Yishtabach.

Be'urei Tefillah using the classic Otzar HaTefillos Siddur.

Volume 1 of the Otzar HaTefillos is at https://hebrewbooks.org/57995

(but this time also using Malbim and other Meforshim, including Rabbeinu Bechaye on Bo).