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[mattkhan]

currently there's only 2 which can get fiddly, can you add more easily? make it user selectable? add 1-2 per actual output channel? I am assuming there is no actual real overhead to this (except a bit of RAM)

[mattkhan]

to clarify the use case (I'm not just being lazy)

there's a certain type of filter that can approximate a linear phase crossover with relatively minimal delay, the filters look like the attached (from https://www.diyaudio.com/community/threads/why-not-iir-filters-a-global-phase-linearization-by-fir.393435/post-7213543). As you can see, 2 copies of the input channel are required so having just 2 user channels gets a little fiddly quite quickly (multi way multi channel setup means you have to be really careful whereas if you had x channels per output channel then you could happily just use them and forget about it)