Hi Dale, Incoming signals have different ranges also because historically analog synths companies didn't really stick to a standard. Those are called CV (control voltage) signals. CV signals cannot have an oscillation value higher than 64 Hz (most common limit is 32 Hz) We have in this setup two CV signals in range of 0-10V, and all the others in the -5V-+5V range. So, both ranges at the same time This would bring some sweet retro compatibility with old products. we would need the spi interface, and the internal reference at 2.5 V is ok for teensy 3.6 to read, that's why i thought ads8638 could do it. I've put down a schematic already, but i hope it is feasible, let me know what you think about. OPA140 for each channel is going to make it really expensive, but if there is no other way.... Regards Pier
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