Sorry I took so long to respond. Several things were involved, really--
First, the simple and inescapable physics relationship of pitch, scale, and string tension: longer pitch means higher tension to achieve the same pitch. Directly to your question: this is always a culprit, whether or not it's 'the' culprit. "Twang" is all about string tension--the obvious example is playing any note on an open string vs. fretted on any lower string.
Again, to my question... does neck composition matter?
I disagree that longer pitch is always a cuplrit. You're oversimplifying this to an the usual degree. What you did was leave out string composition and even worse, string size. tension is not determined by length alone... is it? of course not. If it were, you'd get the same tension with a .050 G as using an .080 or .030. Put a .045 on a 34" scale and put a .030 on a 35". The 35" is longer, so the tension will be greater? Nope.
Not that this was originally about twang
And it's something you can discern right away by playing an instrument--or comparing two instruments--unamplified. Which is why I invariably spend a few minutes in a store playing a bass unamplified before I ask to plug it in.
So did you play otherwise identical 34" and 35" scale Modulus back to back? If not...
BTW I do the same thing in general when I check out a bass... but I also look at the other factors that make it what it is. I can be entirely unimpressed with a bass with it's current setup and then love that same bass when I string and set it up for myself.
Still, as I was shopping for my last bass--which turned out to be a used Conklin Groove Tools 7-string, 34" scale--the concepts I mentioned above remained vague intuitions until I read something that crystallized it all. It was on the site of a formidable competitor, I'd say, to Brubaker: Matt Pulcinella. His point was, if you want what he referred to as 'growl', stay at 34".
And suddenly it all clicked.
I've played several and owned a couple of Matt's basses over the years, going back about ten years. If you want growl out of one of
Matt's basses of course you should take his advice. To think that somehow applies to all basses makes no sense. Unless he could explain why my 36" Contrabass has ridiculous growl.
And just an FYI... reading anything on a site is no substitute for experiencing it in real life. Again, I've played a bunch of basses including his and have found the idea that 34" helps growl to not even be close to being true. For example, Brubakers are 34 5/8"
In this case it's a self-fulfilling prophesy. You
think 34" is better so it will be. If you're ever in Md stop by and I'll show you the error in your ways

. It's neither better nor worse... it's just a scale length. There's nothing magical about 34" being the sweetspot... so why wouldn't 33" be even better and 28" nirvana?
It's not even a playabilty issue... it depends on the overall design of the instrument. I had to stretch much farther playing first position on my Alembic Series 34" 4 than on ANY 35" I've owned other than my Clover Basstard 5.
I'm kind of 'old school' in terms of tone: I think the great sounds were achieved long ago, and can be tweaked but not supplanted. James Jamerson had something going on for the Motown era [although I've never joined the Church of Jamerson; someone else could have and would have done the same had he not existed]. John Entwistle's brilliant performance and sound on 'Live at Leeds' was a clear wake-up call to bassists with a clue. Chris Squire of Yes was on a parallel path and showed us all how bass could drive a song. Stanley Clarke was ripping on upright bass with Chick Corea and--as very few seem to recall--condemned electric bass! he wouldn't play it!--for a while, until he picked up a--surprise--32" scale Alembic--and proceeded to establish another distinctive voice. Again, as few are aware: originally he was playing thru an Acoustic 360 amp with a lo-fi 'woofy' tone that somewhat echoed his upright sound. That's when I saw Return to Forever--twice--a life-changer for sure. His early electric sound was captured on, for my money, the best RTF recording Hymn of the Seventh Galaxy.
I'm 51 and came up listening to all of those guys. Know what it proves? NOTHING
How did they sound on 35" scale basses? How did Jamerson sound with roundwounds? How did they sound with the current crop of amplification? Pickups? Etc.
That's right, we don't have a clue how they
would've sounded back then with any of that so to think that they sounded BETTER because they didn't have any of that stuff makes no sense. Does it?
Finally, Jaco came along, and as a bandmate of mine about thirty years ago pointed out, sounded closest of any bassist to the timbre of the human voice. The rest, as they say, is history.
--and all of this at scale length 34" max. I rest my case.
No offense but that hardly amounts to a case.

. I can go even further point by point to amplify where the holes are if you'd like. What you're saying in some respects amounts to talking about a race track that no longer exists and contending that 70 series tires are best because that's what the best times were posted on... back in the 1960's. As if you wouldn't get other results with things that became available much later on.
