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I agree with EMRR and the real-time analysis. We've been doing this decades, with tons of decent test equipment, I recently caved and bought an old Rhode & Schwarz UPD Audio Analyzer... What a difference, no more one at a time tests requiring signal generators, o-scopes, bridging transformers, etc, no more all night math quizzes.... Plug it in and look at it... change something look at it again. The UPD allows you to change input and output impedances on the fly while your device is connected as well. Amazing what you can learn, and how fast. Math is great, and needed, as is my scope - But a modern real time setup is a HUGE help. In fact, if I had to get rid of it, I would probably just quit... it made it that much easier.