We have regretfully discovered that Bob Longnecker has rescently passed away. Bob was the father of our beloved PFM and PBL sound systems. Just a few months ago, Bob sent us an extended list of whistle combinations for the PFM Sound System II. As a memorial Thank You to Bob, we would like to share the list with you. We have posted it on our web site for all who is interested. Bob will be missed. He made a great contribution to our hobby, SOUND. Here is the link to the whistle list if you have a PFM SSII http://www.pinecanyonscalemodels.com/pfm_sound_system.htm
Cheers, Keith