Apparatus for synthesizing an audio output signal from a parameterized representation of an audio signal, the apparatus comprising: an input interface for receiving the parameterized representation of the audio signal, the parameterized representation comprising, for a time portion of the audio signal, band pass filter information for a plurality of band pass filters, the parameterized information comprising: information indicating time-varying band pass filter center frequencies of the plurality of band pass filters, the plurality of band pass filters having varying band widths, which depend on a band pass filter center frequency of the corresponding band pass filter, amplitude modulation information for each band pass filter of the plurality of band pass filters for the time portion of the audio signal, and frequency modulation information for each band pass filter of the plurality of band pass filters for the time portion of the audio signal; an amplitude modulation synthesizer for synthesizing, for each band pass filter channel, an amplitude modulation component based on the amplitude modulation information for a respective band pass filter of the plurality of band pass filters; a frequency modulation or phase modulation synthesizer for synthesizing, for each band pass filter channel, instantaneous frequency information or instantaneous phase information based on the band pass filter information indicating a time-varying band pass filter center frequency and the frequency modulation information for a respective band pass filter of the plurality of band pass filters, an oscillator for generating, for each band pass filter channel, an output signal representing an instantaneously amplitude modulated and at least one of an instantaneously frequency modulated or an instantaneously phase modulated oscillation signal using the amplitude modulation component for the respective band pass filter channel and using a synthesized frequency information for the respective band pass filter channel; and a combiner for generating the audio output signal by combining the output signals for the band pass filter channels, characterised in that the frequency modulation or phase modulation synthesizer comprises an overlap-adder for overlapping and weighted adding two subsequent blocks of a combined representation of the frequency modulation information and the time-varying band pass filter center frequency for a band pass filter channel to obtain the synthesized frequency information for the respective band pass filter channel. an input interface for receiving the parameterized representation of the audio signal, the parameterized representation comprising, for a time portion of the audio signal, band pass filter information for a plurality of band pass filters, the parameterized information comprising: information indicating time-varying band pass filter center frequencies of the plurality of band pass filters, the plurality of band pass filters having varying band widths, which depend on a band pass filter center frequency of the corresponding band pass filter, amplitude modulation information for each band pass filter of the plurality of band pass filters for the time portion of the audio signal, and frequency modulation information for each band pass filter of the plurality of band pass filters for the time portion of the audio signal; information indicating time-varying band pass filter center frequencies of the plurality of band pass filters, the plurality of band pass filters having varying band widths, which depend on a band pass filter center frequency of the corresponding band pass filter, amplitude modulation information for each band pass filter of the plurality of band pass filters for the time portion of the audio signal, and frequency modulation information for each band pass filter of the plurality of band pass filters for the time portion of the audio signal; an amplitude modulation synthesizer for synthesizing, for each band pass filter channel, an amplitude modulation component based on the amplitude modulation information for a respective band pass filter of the plurality of band pass filters; a frequency modulation or phase modulation synthesizer for synthesizing, for each band pass filter channel, instantaneous frequency information or instantaneous phase information based on the band pass filter information indicating a time-varying band pass filter center frequency and the frequency modulation information for a respective band pass filter of the plurality of band pass filters, an oscillator for generating, for each band pass filter channel, an output signal representing an instantaneously amplitude modulated and at least one of an instantaneously frequency modulated or an instantaneously phase modulated oscillation signal using the amplitude modulation component for the respective band pass filter channel and using a synthesized frequency information for the respective band pass filter channel; and a combiner for generating the audio output signal by combining the output signals for the band pass filter channels, characterised in that the frequency modulation or phase modulation synthesizer comprises an overlap-adder for overlapping and weighted adding two subsequent blocks of a combined representation of the frequency modulation information and the time-varying band pass filter center frequency for a band pass filter channel to obtain the synthesized frequency information for the respective band pass filter channel.