I can confirm success on my Thinkpad Z60m using HDAICOUT.hda.000. Following the same instructions on my Thinkpad R61 (Type 7735), not so lucky, even with 000, 100, 200, and the custom X61 that was posted. I have attached 3 zip files:
Linux codec-dump files
Vanilla HDA 000; output files when running on HDAICOUT.hda.000 (renamed to HDAICOUT.hda)
Vanilla HDA 100; output files when running on HDAICOUT.hda.100 (renamed to HDAICOUT.hda). This was done because my HDAcfg.ini had VerbInterface=$1.
Edit: Reuploaded the Linux Codec, because it was empty files for some reason.
Vanilla HDA000.zip Vanilla HDA100.zip
Linux Codec.zip