Many drum machines used to only responded on channel 10. If you wanted to use two drum machines you had to stick them on different outputs or use a little remapper box; it was a massive pain!
Anyway, using that as an example, if we were to chunk in 4s, your drums might be uncomfortably close to the colour of channel 2, which you might be(?) on more occasions be likely to be using than channel 9. Er ...right? Maybe?
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