It is a matter of record that both the band and EMI were not happy with the final mix that was made by Eddy Offord after the band had left the studios in Atlanta.
Eddy had been approached to mix a Police live album and subsequently rushed ours.
In the UK that mix was released but a new mix with a considerably different sound was completed for the US mix on Capitol Records and subsequent reissues.
Here is "Track By Track" breakdown from band members of the original release
LP ROUGH MIX PLUS STUDIO 'SINGLE' DEMOS
Eyes In The Night Rough Mix
Shock Treatment Rough Mix
Cut and Run Rough Mix
Ark Of Infinity Rough Mix
Atlantis Rough Mix
Rise and Fall Rough Mix
Eyes in The Night Atlanta Demo 1
Eyes in The Night Atlanta Demo 2
Shock Treatment Atlanta Demo
New Track Atlanta Demo
Here is "Track By Track" breakdown extract from the 'fan club' newsletter from the time of the original release of The Sentinel, necessarily upbeat in nature and not expressing the true frustrations endured.