audio seems off. Byl sounds like do.
Also, efekt sounds like ,,wanset" or ,,węset." The whole sentence says ,,Węset do inny."
It really sounds like you got some other audio file (which, to my knowledge, should not be possible), because the only problem I can hear is the female voice stressing E very strongly, like "E-fekt był inny"...
Could I use "skutek" in this sentence instead?
Depends on context, but if you mean result, then yes.