A method for controlling a concealment procedure for a lost audio frame associated with a received audio signal, the method comprising: decoding a first audio frame of the received audio signal to obtain modified discrete cosine transform, MDCT coefficients and grouping the MDCT coefficients into sub-bands to approximate fast Fourier transform, FFT, sub-bands; determining (307-309, 903) values of a first spectral shape based upon the decoded MDCT coefficients obtained for the first audio frame, wherein the values of the first spectral shape consist of first sub-band values of a number of sub-bands and are determined by summing the squares of the MDCT coefficients in each sub-band, calculating a first total magnitude of the MDCT coefficients for the first audio frame and using the calculated first total magnitude to normalize each sub-band value for the first spectral shape; decoding a second audio frame, subsequent to the first audio frame, of the received audio signal to obtain MDCT coefficients for the second audio frame, the second audio frame preceding the lost audio frame, and grouping the MDCT coefficients into sub-bands to approximate the FFT sub-bands; determining (307-309, 913) values of a second spectral shape based upon the decoded MDCT coefficients obtained for the second audio frame, wherein the values of the second spectral shape consist of second sub-band values of the number of sub-bands and are determined by summing the squares of the MDCT coefficients in each sub-band, calculating a second total magnitude of the MDCT coefficients for the second audio frame and using the calculated second total magnitude to normalize each sub-band value of the second spectral shape; converting the values of the first spectral shape into a first approximation of first FFT sub-band energies by applying a conversion factor to the values of the first spectral shape multiplied by a first frame energy of the first audio frame and converting the values of the second spectral shape into a second approximation of second FFT sub-band energies by applying the conversion factor to the values of the second spectral shape multiplied by a second frame energy of the second audio frame; performing a frequency selective transient detection, based on a band-wise ratio between the first approximation of the FFT sub-band energies and the second approximation of theFFT sub-band energies, wherein the band-wise ratios are compared to an upper and lower threshold that represent onset and offset detection; and responsive to detecting the transient, modifying the concealment procedure by selectively adjusting a spectrum magnitude of a substitution frame spectrum. decoding a first audio frame of the received audio signal to obtain modified discrete cosine transform, MDCT coefficients and grouping the MDCT coefficients into sub-bands to approximate fast Fourier transform, FFT, sub-bands; determining (307-309, 903) values of a first spectral shape based upon the decoded MDCT coefficients obtained for the first audio frame, wherein the values of the first spectral shape consist of first sub-band values of a number of sub-bands and are determined by summing the squares of the MDCT coefficients in each sub-band, calculating a first total magnitude of the MDCT coefficients for the first audio frame and using the calculated first total magnitude to normalize each sub-band value for the first spectral shape; decoding a second audio frame, subsequent to the first audio frame, of the received audio signal to obtain MDCT coefficients for the second audio frame, the second audio frame preceding the lost audio frame, and grouping the MDCT coefficients into sub-bands to approximate the FFT sub-bands; determining (307-309, 913) values of a second spectral shape based upon the decoded MDCT coefficients obtained for the second audio frame, wherein the values of the second spectral shape consist of second sub-band values of the number of sub-bands and are determined by summing the squares of the MDCT coefficients in each sub-band, calculating a second total magnitude of the MDCT coefficients for the second audio frame and using the calculated second total magnitude to normalize each sub-band value of the second spectral shape; converting the values of the first spectral shape into a first approximation of first FFT sub-band energies by applying a conversion factor to the values of the first spectral shape multiplied by a first frame energy of the first audio frame and converting the values of the second spectral shape into a second approximation of second FFT sub-band energies by applying the conversion factor to the values of the second spectral shape multiplied by a second frame energy of the second audio frame; performing a frequency selective transient detection, based on a band-wise ratio between the first approximation of the FFT sub-band energies and the second approximation of theFFT sub-band energies, wherein the band-wise ratios are compared to an upper and lower threshold that represent onset and offset detection; and responsive to detecting the transient, modifying the concealment procedure by selectively adjusting a spectrum magnitude of a substitution frame spectrum.