If you’re using temporal effects such as delay and reverb, these generally work best at the end of the chain. Putting a delay at the end allows the effect to give a more natural echo to everything that comes before it; the echo itself will not be altered by other effects. The same applies for reverb. Most guitarists leave reverb as the very last effect, occasionally using the amp’s in-built reverb over a pedal. Amps that have onboard reverb usually use a spring unit which produces a shimmery twang that works well for many types of music. However, if you’re looking for a roomier type of reverb that emulates a giant concert hall, a pedal based reverb is probably what you’re looking for. Either way, putting reverb at the end of the chain provides a spacious, natural tone that simulates a cavernous echo.