Receiver, comprising: a de-multiplexer for de-multiplexing a bitstream to obtain a mono signal and stereo width parameters; a decoder configured for decoding the mono signal: characterised in that: the receiver is configured for interpolating between several time consecutive stereo-width parameters to obtain an interpolated stereo width gain value, the interpolating comprising smoothing stereo-width gain values over a time segment having several stereo-width parameters, a stereo width gain value being a function of a stereo-width parameter, a stereo-width parameter indicating an amount of stereo perspective being present in a first channel and a second channel of a stereo signal, and the receiver further comprises: a parametric-stereo decoder comprising a width block configured for applying the stereo width parameters to a decoded mono signal to obtain a stereo output, wherein the width block comprises a pseudo-stereo generator, and wherein the pseudo-stereo generator comprises a variable gain amplifier configured for amplifying the decoded mono signal, and wherein the pseudo-stereo generator is configured for setting a gain of the variable gain amplifier to the interpolated stereo width gain value, delaying the output from the variable gain amplifier for obtaining a delayed signal, and for adding (223, 225) the delayed signal to two direct signal instances of the decoded mono signal using opposite signs. a de-multiplexer for de-multiplexing a bitstream to obtain a mono signal and stereo width parameters; a decoder configured for decoding the mono signal: characterised in that: the receiver is configured for interpolating between several time consecutive stereo-width parameters to obtain an interpolated stereo width gain value, the interpolating comprising smoothing stereo-width gain values over a time segment having several stereo-width parameters, a stereo width gain value being a function of a stereo-width parameter, a stereo-width parameter indicating an amount of stereo perspective being present in a first channel and a second channel of a stereo signal, and the receiver further comprises: a parametric-stereo decoder comprising a width block configured for applying the stereo width parameters to a decoded mono signal to obtain a stereo output, wherein the width block comprises a pseudo-stereo generator, and wherein the pseudo-stereo generator comprises a variable gain amplifier configured for amplifying the decoded mono signal, and wherein the pseudo-stereo generator is configured for setting a gain of the variable gain amplifier to the interpolated stereo width gain value, delaying the output from the variable gain amplifier for obtaining a delayed signal, and for adding (223, 225) the delayed signal to two direct signal instances of the decoded mono signal using opposite signs. a parametric-stereo decoder comprising a width block configured for applying the stereo width parameters to a decoded mono signal to obtain a stereo output, wherein the width block comprises a pseudo-stereo generator, and wherein the pseudo-stereo generator comprises a variable gain amplifier configured for amplifying the decoded mono signal, and wherein the pseudo-stereo generator is configured for setting a gain of the variable gain amplifier to the interpolated stereo width gain value, delaying the output from the variable gain amplifier for obtaining a delayed signal, and for adding (223, 225) the delayed signal to two direct signal instances of the decoded mono signal using opposite signs.