When recording synths you sometimes want some room ambiance/live amp sound on the keys. Especially when recording a band live this helps to bring a more realistic picture. Unfortunately, most keyboard amps do not deliver the full range of a keyboards sound or even close to it. You end up with a muted high and insufficient low end. One way I have found to remedy this, is to use studio monitors as the keyboard amp. Even the cheapest of studio monitors deliver a much more pleasing result than the high end expensive keyboard amps. Even a nice home stereo will do the trick, anything so that you never have to record another one of those Roland cube keyboard amps!