A hearing aid device comprising - a first microphone configured to receive a first acoustic signal and to convert the first acoustic signal to a first electrical audio signal, - a speaker configured to emit an acoustic output signal into an ear of a user of the hearing aid device, - a first analog-to-digital converter for converting the first electrical audio signal into a first time domain input signal, - a first input unit comprising a first analysis filter bank which is configured to convert the first time domain input signal to a number N I,1 of first input frequency bands wherein the number N I,1 of first input frequency bands is determined by said first analysis filter bank, - a memory unit which is configured to store data indicating which of the first N I,1 input frequency bands are subject to a likelihood of feedback that is above a threshold, wherein the hearing device further comprises - a first frequency band bundling and allocation unit which is configured to bundle adjacent first input frequency bands and to allocate first frequency bands to be processed to a number N P,1 of first processing channels, - a signal processing unit which is configured to process the first frequency bands in the number N P,1 of first processing channels, and wherein the number N P,1 of first processing channels is smaller than the number N I,1 of first input frequency bands, and CHARACTERIZED IN THAT the first frequency band bundling and allocation unit is configured to generate a first bundling and allocation scheme which determines the bundling of the first N I,1 input frequency bands and the allocation of the first frequency bands to be processed to the first N P,1 processing channels wherein said first bundling and allocation scheme depends on the likelihood of feedback to occur in at least one of the first N I,1 input frequency bands, wherein, if the likelihood of feedback is above the threshold, the respective input frequency band is not bundled within the N P,1 processing channels, and if the likelihood of feedback is below the threshold, the respective input frequency band is bundled within the N P,1 processing channels. - a first microphone configured to receive a first acoustic signal and to convert the first acoustic signal to a first electrical audio signal, - a speaker configured to emit an acoustic output signal into an ear of a user of the hearing aid device, - a first analog-to-digital converter for converting the first electrical audio signal into a first time domain input signal, - a first input unit comprising a first analysis filter bank which is configured to convert the first time domain input signal to a number N I,1 of first input frequency bands wherein the number N I,1 of first input frequency bands is determined by said first analysis filter bank, - a memory unit which is configured to store data indicating which of the first N I,1 input frequency bands are subject to a likelihood of feedback that is above a threshold, wherein the hearing device further comprises - a first frequency band bundling and allocation unit which is configured to bundle adjacent first input frequency bands and to allocate first frequency bands to be processed to a number N P,1 of first processing channels, - a signal processing unit which is configured to process the first frequency bands in the number N P,1 of first processing channels, and wherein the number N P,1 of first processing channels is smaller than the number N I,1 of first input frequency bands, and