Comparing a voice, whose tones come totally from a biological construct, with the sound of a bass and rig, whose tones come largely from manufactured objects, is a broken analogy. There is much more gross variation in tones between human voices than there is gross variation in tones between lines of instruments and amplifiers. But even in voices, sometimes you can find two people who have almost the exact same vocal timbre and range, although their accents and singing abilities might be totally different.
I used to have a Guild Brian May guitar. It wasn't an exact copy of Brian's homebuilt guitar, but it had the same scale length, the same type of pickups and electronics, and was made out of mostly the same materials. If I played it through a treble booster and through either a little 9-volt powered amp or a 30-watt EL84-driven class A tube amp, it could amazingly duplicate a lot of the early Queen guitar tones. Of course I couldn't play like Brian (I am still rather crappy at guitar, but was much worse back then). But I could still get 95% of the same tone. Sure, I could only approximate maybe 5% of the technique and ability, so I wasn't suddenly going to become a Brian clone and play just like him. But I could still get that tone; I sounded like ME playing (rather pathetically) with an almost-exact early Queen tone. Now, 10 years later, I can play much better (but still not expertly), but I don't have that guitar anymore, I don't have a treble booster, and no matter what I do I can't get that tone.
It seems the original intended question was not "how can I sound like X?", but "how can I approximate the tone that X got back in specific time period Y?" He may not even be looking to play just like him, but play like himself just with the same overall tone characteristics of the instrument, amplification, and recording/production used by Jack Bruce back then. And sure, maybe incorporating some basic rudiments of the technique he used (whether he plucked the strings near the neck or near the bridge, if he dug in hard or played delicately, how his tone controls were set, etc.). It may not even be necessary to duplicate the exact gear used, maybe some things are more important than others (scale length, general pickup type, EQ, etc.) Of course he's not gonna sound like Jack Bruce even with the exact same gear, unless he plays exactly like him. But he can still approximate the overall basic tone color.
I used to have a Guild Brian May guitar. It wasn't an exact copy of Brian's homebuilt guitar, but it had the same scale length, the same type of pickups and electronics, and was made out of mostly the same materials. If I played it through a treble booster and through either a little 9-volt powered amp or a 30-watt EL84-driven class A tube amp, it could amazingly duplicate a lot of the early Queen guitar tones. Of course I couldn't play like Brian (I am still rather crappy at guitar, but was much worse back then). But I could still get 95% of the same tone. Sure, I could only approximate maybe 5% of the technique and ability, so I wasn't suddenly going to become a Brian clone and play just like him. But I could still get that tone; I sounded like ME playing (rather pathetically) with an almost-exact early Queen tone. Now, 10 years later, I can play much better (but still not expertly), but I don't have that guitar anymore, I don't have a treble booster, and no matter what I do I can't get that tone.
It seems the original intended question was not "how can I sound like X?", but "how can I approximate the tone that X got back in specific time period Y?" He may not even be looking to play just like him, but play like himself just with the same overall tone characteristics of the instrument, amplification, and recording/production used by Jack Bruce back then. And sure, maybe incorporating some basic rudiments of the technique he used (whether he plucked the strings near the neck or near the bridge, if he dug in hard or played delicately, how his tone controls were set, etc.). It may not even be necessary to duplicate the exact gear used, maybe some things are more important than others (scale length, general pickup type, EQ, etc.) Of course he's not gonna sound like Jack Bruce even with the exact same gear, unless he plays exactly like him. But he can still approximate the overall basic tone color.
