You shouldn't be getting much difference using the various techniques. The whole key is to capture BOTH the reference and user spectra SIMULTANEOUSLY. Don't capture one then the other. Start both by pressing X and then Y immediately after. Stop and acquire by pressing Enter.
That said, if you do not have the gain the same between the model and the amp you will get different results, especially when using noise signals. You need to refine the gain by switching between the amp and the model. Technically the best way to match the gain is to use noise and vary it's level and compare the compression but that requires a spectrum analyzer..
That said, if you do not have the gain the same between the model and the amp you will get different results, especially when using noise signals. You need to refine the gain by switching between the amp and the model. Technically the best way to match the gain is to use noise and vary it's level and compare the compression but that requires a spectrum analyzer.