The Salvation Army Tune Book (1987) is available in MIDI format, to play on computer and digital keyboards.
If you have a high quality synthesizer, this may be a good option to explore.
Available for online purchase from UK trade for approx A$50 + shipping.
Clearance stock is available for A$4.30 + shipping.
Questions about connecting to your MIDI keyboard? Contact us for support on firstname.lastname@example.org