The invention relates to a, preferably loop-based, audio-visual mixing apparatus and method for synchronising a plurality of video clips and their corresponding audio streams to create audio-visual compositions. A method is disclosed for creating a synchronised lineal sequence from multiple inputs of audio and video data, comprising the steps of: providing a first input comprising audio and video data; providing one or more subsequent inputs comprising audio and video data, determining at least one rhythm metric unit such as beats per minute (BPM) for each input; and queueing the or each subsequent inputs such that the or each subsequent input is triggered at a beginning of the next rhythm metric unit of a determined input which may be the beginning of a bar. The composition may be created in real time and may utilise a timing algorithm to check that the subsequent inputs are triggered at the beginning of the next rhythmic metric of the previous input.
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