We had some time to work on the ACI (cassette interface) for the replica 1. It’s had its ups and downs but the best success we’ve had was when we used only 5V for the playback and took the -12V supply and tied it to ground. I was able to load/store using a Panasonic RQ-2102, but unable to load an MP3 file from my phone. I want to try a .wav file next but it looks like the cassette interface for the replica 1 is working. If you want to see this produced, feel free to email me at firstname.lastname@example.org and I’ll see if we have enough people interested to make a run of these!