The choppy thing was probably CPU usage then.
For the mp3ify thing, can you send me a crash report (email@example.com). A friend compiled the external for windows and I haven’t been able to test it in context to see if it works fine, so a crash would suggest that it isn’t.
If that’s the case, you can use a vanilla download of cutglove (without the additional windows_mp3 step) and lofi should work fine, it just won’t have the mp3ify parameter (it won’t even show up in the GUI).
For the gamepad itself, have you installed the driver from Microsoft for the gamepad?
People have had to roll their own Mac ones since it’s not officially supported by Microsoft, but there should be a native driver for it.
If you’ve done that and it still doesn’t work can you send an ‘info’ message to an [hi] object in Max to see what the xbox controller shows up as. I have it auto-detect all the versions I’ve encountered on Mac (wired, wireless, different versions of the driver), but it’s possible that the name shows up differently on Windows.
Sorry all this stuff doesn’t work right out of the gate for windows, I just have no way of testing this stuff other than messages like this, so thanks for troubleshooting!