On the input side, all the rules that apply to a FuzzFace also apply to the FF ZIMcard. This means that you should avoid putting buffered effects before the Fat Fuzz, it will kill the authentic tone and create a lot of noise. Like a FuzzFace, the Fat Fuzz input wants to see your guitar pickups only. This way you can use your guitar volume knob to get an almost clean sound. Also, most wah pedals will interact just like they do with a FuzzFace - narrow range and oscillation. To learn more about this, look at the
Foxrox Wah Retrofit.