• Creates delays in the sound audio
• Ends up causing a sense of echo within the sound

EQ - Equalisation 

• High Pass and Low Pass filters
• Equalisation is used to improve an instruments sound or make certain instruments and sounds more prominent
• Can correct problems posed by a room's acoustics
• Commonly used to increase the 'depth' of a mix
• Commonly used to correct signals which sound unnatural 

• Reducing the dynamic range of a signal
• Creates a more even signal, reducing the levels of the loudest parts

• An extreme form of compression
• Creates a very hard cut-off point, over which there is no increase in limit

• Passes audio through them
• Can be used as returns, sub mixers and bus masters

• Overall control of a group effect, good for reverb
• Easy to apply an effect to a selection of tracks using a bus 

• To monitor headroom in system
• Keep track of all tracks together, to make sure they don't go over -10 limit in this case
• Should always have one when editing sound