I’m working on a preamp and would like to compare the FR at different stages of processing. For example, I would like to look at the FR going into the tone section and compare it with the output. Ideally, I would like to subtract the input FR from the output FR. Perhaps using the L and R channels of the QA402.
In summary, I would feed one of the QA402 outputs into the preamp. Hook the left channel input to the input of the tone, right channel input to the output of the tone section, subtract the two and look at the result.
Is this possible?