A number of people have contributed financially since I began accepting donations. Thanks to the following for helping to keep the site going:
- Anonymous 
- Anders Elo 
- Andi Beit 
- Chris Borman [21030194+]
- Jeff Bova [21030407++]
- Dave Bradley 
- Tomislav Brkljacic
- Edward Chen [21030674+]
- David Clarke [21030085++]
- Jack Colburne [21030142+]
- James Coplin [16330036+]
- Paul DeRocco 
- Michael Di Francessco 
- Peter Forrest 
- Fredo Fraile [21040011+]
- Jeremy Helm
- Tom Hughes [21030251+]
- Greg Hutchings
- Mike Jaynes 
- Ron Joseph [21030042+]
- Andrew Kirkby
- Riku-Sakari Kujanen
- Mark A. Lange [21030459+]
- John Leimseider [21030434++]
- Jerry Leonard [21030100++]
- Dan Levin [21030509++]
- Matrix 
- Arun Majumdar [21030348+]
- Brian McCully 
- Frank McGing 
- Jimmy Moyer 
- Christopher Now
- Jesper Ödemark 
- Randel Osborne 
- Joe Porter 
- Marco Rosano 
- John B. Rotondi [21030185+]
- Werner Schöenenberger 
- Chris Smalt [21010280+]
- Mark Smith [2103-PT-002]
- Nobuya Tanaka
- Matt Thomas 
- Ben Vehorn 
- Michael Zacherl 
Many people have written and shared information during the years this site has been up. It would be almost impossible to compile a complete and definitive list. Contributors are noted inline throughout the site. I wanted to give credit here to those who have contributed original material and sent copies of significant historical information. Apologies to anyone I have missed.
David Clarke [21030085++] has been the most consistent and prolific contributor of articles and information, and to the mailing list. There's so much that he has provided that a list would warrant a page of its own; you can see them noted throughout. His major contributions include:
- CPU Plus hardware expansion board (with Sandro Sfregola—see below);
- Expansion Board and New Firmware (with Sandro Sfregola);
- Patch Conversion Tools: software for converting Chroma patches between and among various formats;
- Voice Board Revisions: The Changing Face of Chroma Dual Channel Voice Boards;
- Building New Voice Boards;
- The Chroma Pressure Sensor & Interface;
- ChromaKnob (Chroma Knob Box);
- Chroma Keyboard Velocity Curves;
- EPROM Code and Polaris EPROM Code;
- Fender/Chroma Music System;
- Information on the fan retrofit.
The site would be significantly poorer without his contributions and participation. Special thanks to Dave for keeping things going, and for taking the time to review early versions of the 3.0 site through the fall of 2004.
Sandro Sfregola  has, in addition to the CPU Plus collaboration with David, contributed the articles Expansion Board and New Firmware, and How to swap the original power supply with a readily available switching unit.
Many thanks to Christopher Now for providing a copy of the Apple II/Rhodes Chroma Interface article from Keyboard; a couple of service bulletins I was missing; the warranty form; the January 1987 Chroma Cult mailing; and pictures of the JLCooper ChromaFace and Syntech/Chroma Cult box.
Thanks to Martin Straw [21010093+] for supplying a huge amount of technical information, which will appear on the site over time. The first are Hardware Fault Diagnosis & Repair; Use of the Pressure Sensor, How to Load Patches from Cassette Tape, and Chroma to Chroma Interface Lead.
Ernst Eimer  for his patches and for information on the Kirschning Atari editor. Jim and Vincent Russo  for their patches. Olli  for Programming Manual and Service Manual PDFs; David Gowin  for the Interface Manual PDF. Sandro Traversi  for the Excel version of the parameter chart. Jesper Ödemark  for pictures and information on the EES MIDI kit. Dave Blees  for information on his GenEdit ST Chroma Editor. Jack Colburne  for his excellent photos of the Syntech MIDI kit. Ray Hannisian  for the ChromaGraph manual. Eric W. Mattei [21030443+] for high resolution scans of the product brochure, and the U.S. suggested price list (see Price History). Walt Whitney for putting his patches into the public domain. Don Tillman for the ARP logo.
Thanks to the late Philip Dodds and to Tony Williams for participating in the interview and answering so many questions.
Keyboard Magazine (Keyboard Report, The Synth That Survived ARP's Fall, The Rise and Fall of ARP, Apple II Interface), Peter Forrest (A-Z of Analogue), Julian Colbeck (Keyfax), Martin Newcomb (Museum of Synthesizer Technology), International Musician (Synth Check), PAIA (Fender's Triad Interface), and Future Publishing (E&MM keyboard and sequencer reviews), for article reprint rights. Kenton Electronics for providing their Self-Install MIDI Kit documentation. Gene Stopp for his notes on the Chroma VCO. Arcprint for a deal on scans of the Polaris Service Manual schematics. The Vancouver Public Library for their efforts in obtaining inter-library loans of Electronics & Music Maker all the way from the UK.
Ron Bertoncini for help with XHTML/CSS.
Site v3.0 beta testers: Don Tillman, Vincent Russo , Murray Macdonald [21030276+], Paul Hackett-Evans , Edwin van der Heide , Åke Danielson , Jesper Ödemark .
Thanks to my family, Margarita and Karina, for their support and patience.
And to all the members of the ChromaTalk list over the years, whose posts have contributed greatly to the value of the site, and made it far more than I could have hoped or imagined when I started this whole thing back in 1999.