Hello,
The easiest low teck solution would be to have a dedicated loudspeaker in front of every microphone, and send an audible "bang" simultaneously.
Thanks Cyrille! Yes, indeed. I am however trying to record at two rather distant locations which would make it difficult to sync the two signals with an audible clap or "bang". Another option I have found is to play a terrestial radio station on two analogue AM/FM radios to both signals. However, I am wondering if with all the digital technology we have, whether there is a (Pd) solution. :)
best, P