Turing wrote:

I need a manual for IOGEAR Sympathy KVM model GCS1774
Symphony, not Sympathy ___^^^^^^^^

It comes with a manual. Is it not written in your native language? Got
it at a garage sale (aka rummage sale aka dump sale), so parts missing?

Is there a reason you cannot go to Iogear's own web site to get the
manual on their product?

https://www.iogear.com/product/GCS1774/
Click the "Product Manual" download link on the right side.

Available in English and French.