RobinKidderminster said:Tut tut. Surely irrelevant here but nevertheless, these are mixed for that particular format. Discussion here is using a standard stereo source processed into 3.0 or 3.1
Suggest you read back to OP.
Tut tut. steve_1979 specifically asked whether anyone knew of any recordings actually made or mixed in three-channel, so I answered his question. The discussion had moved on from the OP's question, for right or weong – or are we only allowed to answer the original post now?
And by the way, they're not 'mixed for that particular format', but were recorded with three discrete channels, using just three microphones.
Suggest you read.