Ding was written by David Norman, who can be contacted by email at david (at) ellought.co.uk. Ding Unity was written by Giles Wood, who can be contacted by email at gilesrwood (at) gmail.com. It was tested by the ringers of St James, Trowbridge. The tower bell audio is taken from Great Yarmouth Minster - thanks to Chris Richmond for providing his recordings of the individual bells of this tower. Thanks also go to Mick Angrave for providing the handbell audio used in Ding Unity, and to Lenka Stokes for writing the Ding Unity user manual.