Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Since you do not say where in the world you are, then nobody will recommend an electronic parts distributor in their country.
The IC is made by an IC manufacturer in Taiwan. E-mail them and hope they have somebody who speeky zee English who can tell you where to buy their IC in your country.
Did you try Google?
PT2399 2399 Echo Audio Processor Guitar IC