# 1 to 3 Utility Buffer Standard voltage Follower:  https://www.skullandcircuits.com/utilities-buffered-multiple/?v=d3dcf429c679 https://ultimateelectronicsbook.com/op-amp-voltage-buffer/ https://www.eddybergman.com/2020/03/synthesizer-build-part-25-universal-cv.html Useful for splitting an input over 4 outputs, ( or 3 in this case and one of the buffers drives a bidirectional LED) CV voltages or audio. This is a utility board, so you can hook it into just about anything. Input Resistor can be 100k or 1m or anything in that range I guess Output Resistor I have as 1k...but 100r is common. So long as you have a high impedence input and low out.  Stick to whatever you have going...although...1 meg input is prob better Features: - Eurorack Power - +/- 12 voltage source - 1 to 3 ( or 4 if you ditch the led ) After ditching the 4th buffer for an LED, it would seem this is the same as the Skull and crossbones version except that the S&CB has 2 decoupling caps for the op amp. That is probably a better design, but this seems to work fine.