I am new to this and trying to learn about designing analogue audio filters. I looked at a couple of tutorials online that gave examples about how to implement and simulate high and low pass filters. I used the internal plot tool to checkout the output using a decade sweep, but both my high and low pass filters exhibit high pass filter behaviour. The filters themselves are first order filters, where the only difference is I have swapped the position of the capacitor and resistor. I could provide the settings I put into the AC Analysis simulation command, but I believe the .ac dec 20 1 20k section describes that adequately. I hope I have shared enough info to make my mistake obvious to anybody that can help.