Handy private archive of dbx reference material and service manuals...
http://vintagedbx.free.fr/dbx.html
dbx searchable...
http://www.dbxpro.com/
http://www.dbxpro.com/Classic_resources.php
The manual for the 224X which is different in that it adds front panel lightshow and level adjustments. Otherwise, functionally the same.
http://vintagedbx.free.fr/doc/22-222-224_II.pdf
Be advised that this is a two-ended system that must be used on Playback if it is used on Record. Don't bother using it for anything but analog TAPE. CDR-Audio has plenty of dynamic range and no noise floor to speak of.
If you dont already have one, I advise you to get a dbx 400x or 400x-ds to manage the 224 and any other processors you may have. It is an amazing piece of equipment that allows you to place 3 processor loops before or after the encode/decode loop, or bypass them altogether or in any combination, PLUS you can dub encoded or non-encoded music to or from either encoded or non-encoded music unlike the previous dbx 200 or 200x. I have the 224x plus a 400x and a number of other dbx, Pioneer, BSR, Carver, BBE, SAE and ADC goodies; and have created some impressive cassettes back in the day, given the limitations in speed stability. Now-a-days I make impressive CD's of old analog source recordings with improved dynamics, less noise and zero wow and flutter.
Look for a 400x on eBay. Snipe it at the last 10 seconds if you don't want to bid against yourself..
http://cgi.ebay.com/DBX-400x-Program-Route-Selector-/250818700329?pt=LH_DefaultDomain_0&hash=item3a65f5a429
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