So I've run into a particular issue while modding voicelines. There's 2 particular sequences where replacing the voiceline, even while following the proper software requirements for them (22k Hz, .WAV, Mono, 8-bit PCM). It's the scientist on the catwalk after "Unforeseen Consequences" (c1a0_sci_stayback, c1a0_sci_catscream), and the two scientists at the beginning of "Blast Pit" (c1a4_sci_rocket, c1a4_sci_tent). Instead of playing the .WAV I assigned them, nothing plays at all; instead, their model just moves while being completely silent.
I haven't had any issues with other lines. However, despite what I have tried, it seems like these sequences are irreplaceable via normal methods. Any solutions? Thanks.