Lowering voltage for microphone ?

I have one of those voice changer things, and it has a built in speaker, which sounds like total cr@p. I would like to put a regular jack in the bottom, so i can hook it to a computer microphone input. I would just connect it to the speaker, but I am thinking the power would be too much for the microphone input. Anyone know what I would need to do to lower it/ do I need to lower it/ would just a simple resistor work?

Thanks

Yes, you need a resistor or two.
One in series and one from hot to ground on the PC side.

Better to connect the output to the line input on the sound card.
You may not need any resistors.