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The tonotopic representation of sounds is a well established organizational principle of the auditory cortex. However, given the small extent of auditory cortical regions, mapping tonotopic representation using noninvasive tools such as M/EEG is challenging. Resolving ongoing brain activity at a tonotopic level has been deemed virtually impossible due to volume conduction. However, based on previous data showing robust carrier-frequency decoding, it is clear tonotopic information is present at a noninvasive level. In order to also eavesdrop on ongoing activity, we propose that backward encoding models can be tuned to specific sound frequency bands applied to other data sets and to model neural activity in resulting “feature” (here: sound frequency band) channels.