A small mod that changes the sounds of the combinators to dial-up noise. It has 3 different "connection" sounds and the sound of a phone being hung up
Note for 1.1: if the combinator is activated even briefly, the "connection" sound will play until the end
Note for 2.0: the connection sound and the operation noise play simultaneously, I asked about this on the forums but no one answered me. Plus, I did not find how to make the connection sound correspond to the speed, like when working, for example.
A small fact, after the "famous" connection sound, in reality, only noise is heard (this can be confirmed by picking up the phone during an established connection or by typing the AT command that always turns on the speaker on the modem), so if the combinator continues to be active, I made a simple noise cut from the end of the handshake.
Showcase(2.0):
https://github.com/asvdvl/dial-up-combinators/raw/refs/heads/master/showcase.mp4
Original files recorded by me with 2 Acorp 56k and one from wikipedia