LTspice help

[vendettav]

So im still troubling with my stratoblaster which gives me a weird fart kind of effect when hooked to my RP355. I think it could be impedance problem but an interesting thing is that my Vd is 7-8v which is not 1/2 of my 9v
so i figured I'll try to simulate it in LTspice only that i don't get how. i've got the schematic drawn but i dont get what to put in the audio input place or how to simulate it in the end. a step by step would be so appreciated

[anchovie]

http://www.diystompboxes.com/smfforum/index.php?board=41.0