Hi all,
some time ago Christian Klippel mentioned his cvbox analog/digital converter for parport... now there's a Pd object available to get acces to the up to 88 input channels. It supports 8, 10 and 12bit resolution AD converters. As allways I just tested it to run under Win2k but Linux should be possible as well (see the readme for details).
Find it at http://www.akustische-kunst.de/puredata/cvbox/. Christians jMax object and the detailed description how to build such a box can be found at http://mamalala.de/files/electronic.html
Olaf