Here are some examples, videoes I made using a PC TV/Video capture card hooked directly to the original A/V output on my C64. Correct me if I am wrong, but I don't think a 1541U user could do any of these.
Commodore 64 Battle Chess Easyflash in turbo mode: https://www.youtube.com/watch?v=VZr7F9moCr8
3D Pool Game on Commodore 64 in turbo mode: https://www.youtube.com/watch?v=Mw7Th5Kv7u0
Printmaster Plus in turbo mode: https://www.youtube.com/watch?v=rQZ0pFiihmQ
Motorhead - Orgasmatron full song on a C64 w/8580 SID(8bit 48Khz): https://www.youtube.com/watch?v=BBY087IfWPs