I’ve downloaded the free 1650 Psalter app.
Emulating the old split-leaf format of the classic Psalter (Psalm Hymn Book) this app has lyrics (the complete 1650 Scottish Psalter) and midi music of the tunes that are set for each Psalm. Other tunes of the same metre can be selected to play instead as well. Even though the those texts of Psalms don’t get used very widely in Australian Presbyterian circles, the index of tunes is a great resource in itself.
There’s a bunch of other features as well.
Did I mention it’s free?
Search for 1650 Psalter in the various app stores.
Thanks to Scott Clark at Heidelblog for the tip off.