Forgive the long story, but I need some sage advice. It's been a couple months since I started playing bass seriously. About 30 days ago I picked up a Yamaha TRBX605FM as I had doubts about the size of my Ibanez BTB675 which I bought on the spur of the moment because it was so beautiful. After playing the 675 for a few days I thought I needed something smaller. Got a great deal on the Yammie and thought it would be ideal. It feels great. The build is great. Different than the Ibanez. But since then two things have changed... I've grown into the Ibanez, but at 10 pounds plus I don't see myself doing 3 hour standing gigs with it. I love that bass now and while it is big and heavy I don't feel it's that big any more. But the second thing was the acquisition of a GK MB112. I never owned a bass amp before. I chose the GK because of it's clarity and simplicity. And that's where the problem is... It's revealed the nuances of my basses. I'm not crazy about the nuances of sound and sonic limitations that I can't figure out how to get past with the Yamaha. Is it me? Is it a mis-match with the amp? I dunno. The way I would describe the sound that I'm hearing would be "inarticulate". To help illustrate the term, in the middle of a phrase there are three passing half steps, C-C#-D (3rd string fr3-5). Instead of hearing the distinct steps they all permutations of the same note. I played it again several times and had difficulty with the distinction. Then I plugged in the Ibby and heard defined half steps. Same with my Squier with Aguilar noiseless and heard distinct defined notes. I'm also not getting what I consider to be a good articulation when I do slap stuff. Everything just sounds weak (?). I know my technique isn't there yet, but I sound better on my other basses. I know this amp doesn't have a tweeter like the TCE BG250's, but still getting pretty good sounds with the other basses. I'm not sure if I'm doing anything incorrectly or it's the bass itself or what I should try? Could it be the amp and my lack of experience dialing in sound? But I have until tomorrow to decide to keep it or return it and could use some advice flushing out whether I should press on with this bass or just return it. TIA for your help.