Welcome to my lair,
@sunvalleylaw.
So, I had a Mosaic. It’s an interesting doubler/shifter/mod thing that can get some good sounds, but it’s not 100 a accurate for THAT sound. I’ve also owned several electric 12s over the years. I currently have a Rev Airwave. The Mosaic reminded me how much I missed playing 12 string and I sold it when I was scrounging up cash for the Airwave. So, if you want the electric 12 sound, buy a 12. The Dano 12 is fine as a low cost option that sounds good and will fit most people’s needs unless you’re a madman who picks up a 12 a almost a default.
As to jangling in other ways, it’s very much a technique and writing thing. You want to emphasize the highs and upper mids as was said. And single coils are often what you’re looking for—although both Marr and the dude from the Las played 335s a lot of the time. I like filtertrons for jangly work as well. The Guild minibuckers are also swell. I find that strats are a good basic guitar for jangle pop tones—there’s a number of sonic options and they take compression and modulation well. And a lot of what jangle pop jangle is sitting things in the mix just so.
Another key element of what makes jangle pop sound like jangle pop is a blend of acoustic and electric instruments. Having acoustic guitar in the mix as a dominant rhythm sound is key if you’re doing 60s Beatle-inspired (Rubber Soul, Hard Days, etc.) jangling.
As for lead lines and jangly guitar parts—repetition, repetition, repetition. You wanna avoid vibrato or other “feeling” type techniques like Pop Art folks hiding brush strokes. Mechanical duplication of arpeggiated parts across two or three strings biting off little bits of chords and shifting one or two notes at a time. Also, when it comes time to show off a bit, you’re looking for ascending/descending runs to punctuate musical phases, echo a vocal, etc.
Effects-wise, compression can help get the sound just so and level off arpeggiated parts. Verb can give some room to the sound. Apply chorus or phase as needed for swirlies.
In general, jangle pop is rooted in aping the sounds of guitar-based-pop of the mid 1960s. So the more of that stuff you listen to, the more it starts to make sense as an approach.
EDIT: On full chord “rhythm” parts the upstrum is key as a point of emphasis. It’s hard to explain but you want to introduce the idea of looseness or slackness to the part even if you’re playing in a rhythmically “tight” scenario. Think of the sloshing of sleigh bells.
