I had the privilege of meeting Steve Perry and picking his brain. He told me the whole story on how that solo came about. He recalls it being a Fender Twin Reverb with a wah pedal slightly opened. They were supposedly working on something else and at the end of the day, Steve wanted to go back to Who's Crying Now as had an idea for a melody for an outro solo... Neal plugged into a Twin and Steve sang him the melody to the intro part. Neal improvised the rest. Steve was very taken by the beauty of the solo and called Herbie Herbert (manager) to come down immediately to hear it. In the end, the label wanted to cut the solo out as they thought it was too long and radio wouldn't touch it. Steve fought for it and said "over his dead body." Steve won the battle and the rest is history.