Yeah...I don't recommend putting diagnostic gear into a functional synth build...but if you DO have a large setup, having a little "test pod" like this is damned useful. For one thing, it's small enough that you can move it around to where it's needed. And the O'Tool's functions are also pretty useful for checking calibration, etc on most ANY musical instrument, so this is set up so that it'll take any typical synth patchcable and you can still set up the 3.5mms on the pod to do any sort of test you'd normally do with a NON-modular synth. Plus, if you want to "relic" some calibration settings on a synth so that you've got a bit more of an "aged component" sound, you WILL need several instruments such as a frequency counter, voltmeter, o-scope and so on...or, just this pod.