Mine is the Trailer release dated 1977 LER 2091 with a yellow label.

Mine's the Highway release - there may well be some difference in quality between the two as they were pressed on separate occasions, probably in a different place.

The mix, as Ralphie so rightly observed, will appear to vary according to what speakers are used. In short, the cheaper the speakers, the more the vocal range tends to be favoured. On my copy the vocal sound is tonally weak in comparison to 'Devil' but not particularly quieter in the mix.

My copy of 'Devil' seems to be a hybrid - the record itself has a standard Transatlantic label, the back of the sleeve says it's Logo Records but has a Trailer sticker on it, and the front says as part of the design 'The Leader Tradition'. Whatever, it was good enough to sell me a Fylde guitar (or two).