Audio signal synthesizer for generating a synthesis audio signal having a first frequency band and a second synthesized frequency band derived from the first frequency band, comprising: a patch generator for performing at least two different patching algorithms, wherein each patching algorithm generates a raw signal having signal components in the second synthesized frequency band using an audio signal having signal components in the first frequency band, and wherein the patch generator is adapted to select one of the at least two different patching algorithms in response to a control information for a first time portion and another of the at least two different patching algorithms in response to the control information for a second time portion different from the first time portion to obtain the raw signal for the first and the second time portion, wherein the patch generator is adapted to operate in a time domain for the at least two different patching algorithms; a spectral converter for converting the raw signal for the first and the second time portion from the time domain into the spectral domain to obtain a raw signal spectral representation for the first and the second time portion; a raw signal processor for processing the raw signal spectral representation for the first and the second time portion in response to spectral domain spectral band replication parameters to obtain an adjusted raw signal spectral representation for the first and the second time portion; and a combiner for combining the audio signal having signal components in the first frequency band or a signal derived from the audio signal with the adjusted raw signal spectral representation or with a further signal derived from the adjusted raw signal spectral representation to obtain the synthesis audio signal. a patch generator for performing at least two different patching algorithms, wherein each patching algorithm generates a raw signal having signal components in the second synthesized frequency band using an audio signal having signal components in the first frequency band, and wherein the patch generator is adapted to select one of the at least two different patching algorithms in response to a control information for a first time portion and another of the at least two different patching algorithms in response to the control information for a second time portion different from the first time portion to obtain the raw signal for the first and the second time portion, wherein the patch generator is adapted to operate in a time domain for the at least two different patching algorithms; a spectral converter for converting the raw signal for the first and the second time portion from the time domain into the spectral domain to obtain a raw signal spectral representation for the first and the second time portion; a raw signal processor for processing the raw signal spectral representation for the first and the second time portion in response to spectral domain spectral band replication parameters to obtain an adjusted raw signal spectral representation for the first and the second time portion; and a combiner for combining the audio signal having signal components in the first frequency band or a signal derived from the audio signal with the adjusted raw signal spectral representation or with a further signal derived from the adjusted raw signal spectral representation to obtain the synthesis audio signal.