Apparatus and associated methods relate to training FIR filter coefficients by deconvolving a first input signal and a second input signal in the frequency domain, both of the signals being generated in response to an undetermined broadband excitation applied to an acoustic body instrument, until a fidelity of the second signal convolved with the trained coefficients meets predetermined fidelity criteria relative to the first signal. In an illustrative example, a musical instrument pickup signal and a microphone signal from the musical instrument may be sampled, segmented, and transformed to the frequency domain. FIR filter coefficients may be, for example, trained by block deconvolution in the frequency domain of the microphone signal and the pickup signal. In various examples, the trained FIR filter coefficients may adapt the pickup signal to mimic microphone performance, including full-body acoustic content.