i) Choralia provides audio files which allow you to learn your part by listening to electronically synthesized 'singing'. It is free of charge, however there are adverts. Donations to the site for its maintenance are invited. There are three levels: 1st, with an individual part only plus metronome; 2nd, with emphasis of an individual part with other voices; 3rd, all voices are synthesised with the same sound and same volume. You are able to adjust the tempo and volume as you progress.

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To access Choralia files for each individual part, click on the picture or this link https://www.choralia.net/rc03mp3/rc03mp3en.htm