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There's no reason for you to use altered tunings on a 4- or 5-string bass. The fact is that most of your playing will be single notes. Altered tunings are sometimes used with guitar to allow ease of voicings in playing chords. You don't have to worry about that. I began playing bass at 15 years of age. One year later, at 16, I began playing acoustic guitar as well, and I took classical guitar lessons (and I'm now 46). I have used alternate tunings for years in my guitar playing. I have NEVER even so much as used drop D on the bass. What's the point? You have no problem getting the notes you wish in your bass lines. If you have an odd piece of music that requires you to play chords, well, an altered tuning of the bass might be in order, but with a 4-string bass in particular there's only so much you can do. Root-third-fifth, maybe root-third-flatted seventh or -major seventh, that's about all you'd need for a chord and that can easily be accomplished without changing a single string. Your guitarist probably knows nothing about playing bass, and you can safely ignore him.