Hi all.

I have Slim Phatty which is a very good sounding synth, but its multifunction knobs are absolutely not comfortable for me.

Behringer Model D has significantly more practical controls, like an original Model D.

Should I sell my Slim Phatty and buy Behringer one? Are they sounds interchangeable?

I had both and didn't find they sounded the same. You could get some similar sounds out of course, but to me they had a different vibe. I'm no sound design Einstein
(sound designstein?) tho lol...

To me the Slim phatty is warm and fuzzy, sort of has a 70s psychedelic vibe. All meaningless descriptive terms, but you know how it sounds anyways... I like that you can get 1-4 pole resonance, as it opens it up a little more.

Model D sounds big and futuristic to me (I know it's based on a much older synth). Obviously it has an extra oscillator and different filter options... The patch points also really open up your options, tho only if you have other modular/semi-modular gear

I had them linked up for awhile (either D into phatty or phatty into D), and really liked the sounds I got out of the combo.

I only sold the D because I got a Matriarch, but I did choose to keep the phatty over the D because I preferred the sound. Up to you which sound you prefer of course, but that was my experience. Both are great synths, so hard to make a firm recommendation.

You could order a Boog and if you don't like it, send it back. Or buy a used one and if you don't like it, sell it for what you paid for it. The Slim Phatty interface has never appealed to me at the price, even if it does sound great.

if the Slim isn’t working for you, then its probably time to move one. I have had it twice. It sounds really great but so do a lot of synths. The interface isn’t my favorite either. But it’s sorta collectible now so you may pay more if you ever want one again. Personally, that doesn’t matter much if it’s killing your workflow.

You can get a used model d for like $200. Buy one and see for yourself. Don’t sell the slim phatty. I agree that it may appreciate in value and, consequently, become difficult to replace. They are not interchangeable to me. I have both and use the slim phatty way more often. It’s been more useful than the d for recording bass and also for patch memory. That said, the tone of the model d is also beautiful and it can be more fun to fiddle with. Ymmv.