ANALOGUE SYSTEMS RS-310 DUAL BUS

  Almost without exception, raw audio signals benefit from treatments that add movement within - or ambience to - the sound, so engineers have developed many devices to achieve such effects. Tape Echoes were among the earliest of these, and these used tape loops running past multiple record/ replay / erase heads that added discrete echoes to a signal.  The early 1970s saw an explosion of affordable devices that used cheap analogue delay lines to generate their sounds. Unfortunately, the delay times available from these were usually limited to a handful of milliseconds. This meant that they were unsuitable for imitating the luxuriant Grand Canyon effects of tape echo machines and digital echo units. Rather, they were more suited to creating flanging and chorusing (where the required delays are shorter) as well as short reverberant effects.  However, no matter what they were called, all these effects used the same basic building blocks. The first was an input circuit that accepted the