Audio apparatus and method therefor

An audio apparatus comprising:

• a receiver,
• wherein the receiver is arranged to receive room metadata,
• wherein the room metadata is indicative of a plurality of properties of a room;
• an estimator circuit,
• wherein the estimator circuit is arranged to determine a flutter echo estimate for the room in response to the room metadata,
• wherein the flutter echo estimate is indicative of a level of a flutter echo in the room;
• a signal generator circuit,
• wherein the signal generator circuit comprises a feedback delay network,
• wherein the feedback delay network comprises a plurality of feedback loops,
• wherein the signal generator circuit is arranged to generate a flutter echo audio signal from first output signals,
• wherein the first output signals are from a first portion of the plurality of feedback loops when the plurality of feedback loops are being fed an audio source signal;
• and
• an adapter circuit, wherein the adapter circuit is arranged to change a first parameter for a first feedback loop of the first portion of feedback loops in response to the flutter echo estimate.