Digital Delay:

A delay device takes a signal input to it and plays it back after a specified delay time. Having one 'echo' is rather limiting however so the device also has a feedback control to take the output of the delay and send it back to the input. The repeated sound becomes quieter with each repeat (decays). The feedback gain has to be set less than one or this will generally result in instability. If the sound reflection is less than 30 milliseconds then we perceive it as the same sound. A time of around 30-60ms with no feedback parameter set will produce a 'doubling' of the sound effect.

This is clear, concise and with effective audio samples. Slap-back, Multi-Tap Delay, Ping-Pong 'echoes' and the differences different delay times produce can be clearly heard and are carefully explained. Also included is a discussion of analogue tape delay. The following equation is useful for calculating 'musical' delay time. Delay (in milliseconds)= 60,000/current tempo. This gives the delay time for one crotchet beat. (To get a quaver beat divide this by 2 etc) Cubase VST includes StereoEcho as a Send effect which is worth experimenting with.