I might be a loner on this but as long as you use caps rated for audio, you can google them, they are available, you should be alright. I just did an experiment with my current ipod/pico setup. I made an ipod lod with two large 100uF capacitors in preparation for an in-house iMod and even directly out of the stock iPod, the sound got way better when I connected those capacitors, I did not expect that. I can only imagine when I'll do the iMod that this is going to be very sweet. Those capacitors came from an old German guitar amplifier (Siemens caps).
