Seamless audio transfer in a multi-processor audio system

A processing unit for an audio system of a vehicle comprises a first processing node, a second processing node and a program memory. The program memory may be overwritten by the first processing node and by the second processing node. After the processing unit has started up the first processing node may compute and write to the program memory an audio output. The processing unit may also perform a handover of the computing of the audio output from the first processing node to the second processing node when the first processing node has overwritten the program memory up to a predefined point and when the second processing node is operational. The second processing node is designed to compute the audio output after the handover, and to write this audio output to the program memory.