I found the SH-10 clips in one minute?
http://cdn.seymourduncan.com/audio/support/humbucker/Track27.mp3
http://cdn.seymourduncan.com/audio/support/humbucker/Track28.mp3
as for the whole lotta humbucker sh-18 i have no idea of why it is not updated but i am sure it is just a oversight, i really doubt seymour is out to turn players away?
So rather than get turned off just call the custom shop,they will answer any questions you have.
MJ was a huge help to me when getting a 78 a few days back
Contact Information
5427 Hollister Avenue
Santa Barbara, CA 93111-2345, USA
Tel: (805) 964-9610
Fax: (805) 964-9749
OR if you prefer email the custom shop,
http://www.seymourduncan.com/support/contact-us/customer_servic/
Seymour makes what are to me the best pu's available for the price but sometimes web sites have issues which have nothing to do with the quality of the product. You may want to mention that it fustrated you that you could not find this info out on the tone chart or sound samples, they may not even be aware of these things?