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For that size, probably the ES-8 would make the most sense...IF you opted to go with a module as a solution. However, CV Tools and so forth can ALSO use any DC-coupled audio interface to do the same thing. Not only is this way cheaper, it's also just as expandable since you can chain up more I/O via the ADAT Lightpipe interface. I currently use a MOTU 828 mkii for this, works just great. But here's the real point: you can get these older "obsolete" interfaces for dirt-cheap. Right now, the original 828s go for around $75 on Reverb, with the mkii coming in only a bit higher, and either are just fine for this purpose. So if you felt you needed 16 channels of CV/gate/trig/clock send, you can get there this way for $300 LESS than the ES-8...and also wind up with more outputs than the ES-9!