...also, check the PCB layout- e.g. for electrolytic caps, if the hole-spacing is close, you need a radial, and if they're far apart you need an axial.
As a general rule ceramic caps are usually used for lower values <1000pF (1nF) -BUT they're often used in values up to 100nF (0.1uF) in power supply decoupling roles.
If the cap is in the audio path, I'd stay away from a ceramic. If it's between a power rail and ground, then a ceramic will do the trick.
Sometimes small-value caps are needed for compensation- connected between two pins on an op-amp (NE5534 etc) or across a feedback resistor to limit the bandwidth. A ceramic can be used here, but for stability a polystyrene or even mica (in high-stability situations) capacitor can be used....
Often a search of the forum will bring up a good picture of someones project they've done, and you can have a look at the caps etc and see what they've used in a specific project.
:thumb:
Mark
