The problem with cheap cables is that they are usually unshielded, which adds a lot of noise to the signal. HD Retrovision cables aren't too expensive and are properly shielded for your ps2. For game cube, the RetroBit and Bitfunx cables are the same and have audio issues. You're better off getting a gcvideo device (eg Prism, Carby, etc...) and sending that into a HDMI to component converter. My go to for that is usually on RetroRgb's tested products list. Alternatively you could use those component cables along with the audio from the multi-out if required.