This is the first of three videos looking at the use of sends in mixing a song. It covers the classic use of sends for effects channels, whereby the signal from multiple tracks is routed to a single effect on its own channel. This allows the effect to “glue” the tracks together and reduces the processing demand on the computer from multiple instances of the same effects plugin, as well as making it simpler, as only one plugin needs adjusting to change the mix, rather than several.