Hey guys, not specifically related to the Audio stuff with the Teensy, but everyone here has been super helpful in the past so I was wondering if anyone could help with my multiplexer wiring:

I can't really explain the behaviour I'm seeing, but the values being read from the multiplexer are not right. Sometimes clicking a button will set off other multiplexer inputs. If I only have one input wired it seems to work fine, but I'll get pretty crazy random readings from the other input pins (even with nothing connected to them) as soon as I add multiple buttons. I don't think theres any problem with the code or my inputs because when I directly wire inputs into the A2 pin it reads normal. I grabbed some resistors at a store today, in wirings I've seen online it looks like they sometimes use resistors but I'm not sure if that's a problem or how I would even determine what value resistor to use.
It is a CD74HC067, and the T4 in the diagram refers to the teensy
Any help would be much much appreciated!! Thanks

I can't really explain the behaviour I'm seeing, but the values being read from the multiplexer are not right. Sometimes clicking a button will set off other multiplexer inputs. If I only have one input wired it seems to work fine, but I'll get pretty crazy random readings from the other input pins (even with nothing connected to them) as soon as I add multiple buttons. I don't think theres any problem with the code or my inputs because when I directly wire inputs into the A2 pin it reads normal. I grabbed some resistors at a store today, in wirings I've seen online it looks like they sometimes use resistors but I'm not sure if that's a problem or how I would even determine what value resistor to use.
It is a CD74HC067, and the T4 in the diagram refers to the teensy
Any help would be much much appreciated!! Thanks