I highly doubt that. With some exceptions later in their career and at the very beginning, the Grateful Dead handled most of their own technical work. So, certainly anyone who was working with them would probably have had a lot of sympathy for his point of view, shall we say. He also has had a good understanding of the technical aspects of music, so its doubtful that he would have been limited to such abstractions in making his views heard.
Early on, the Dead did have difficulties in the studio interfacing with the straight world resulting in a letter from Joe Smith, their Warner Bros. rep, to their manager that read in part:
The recording in New York turned out to be very difficult. Lack of preparation, direction and cooperation from the very beginning have made this album the most unreasonable project with which we have ever involved ourselves.
Your group has many problems, it would appear, and I would believe that Hassinger has no further interest or desire to work with them under conditions similar to this last fiasco. It's apparent that no one in your organization has enough influence over Phil Lesh to evoke anything resembling normal behavior. You are now branded an undesirable group in almost every recording studio in Los Angeles. I haven't got all the New York reports in as yet, but the guys ran through engineers like a steamroller.
It all adds up to a lack of professionalism. The Grateful Dead is not one of the top acts in the business as yet. With their attitudes and their inability to take care of business when it is time do so would lead us to believe that they never will be truly important. No matter how talented your group is, they're going to have to put something of themselves into the business before they get anywhere.
More is explained at this link:
http://www.blairjackson.com/chapter_eight_additions.htm and if you read the quotes about Phil, you will realized that the difficulties were more a case of cultural miscommunication than some spaced out drugged up hippie being weird.
BTW, hearing colors is known as synthesthesia. My wife is synthesthetic and as an artist has utilized this to her benefit. (
www.artscent.com and
http://www.wix.com/dshartstudio/dawnspencerhurwitz) Her visual art is informed by her career as a perfumer, which in turn was inspired, both in structure and technique, by her painting background. Her paintings often have fragrances that go with them (and those fragrances themselves, as art pieces in and of themselves, are constructed with the concept that they exist beyond being created to exist as a pretty thing that you wear). So, if you were constructing a fragrance with her and requested more purple, not only would she take you seriously, she'd do it!