I acquired a 1982 Mesa Bass 400 not too long ago and am still working out the kinks with it. I can get some beautiful fingerstyle tones out of it that are nicely responsive to my playing style and attacks. I still havent been able to dial in an awesome slap tone- not sure what I'm doing wrong. I am using an Ibanez bass and this might be part of it since its not particularly mid-rangey. To get the fingerstyle sound that I like, I have my EQ setup with a "frown" look to it. Bass set at 7, pulled out. Treble set at 4. Dont remember my mid, but it might be boosted a bit too. I use the top channel for fingerstyle, but kind of like the bottom one for slap tones better. My bass is set about even with a slight boost to bass/treble. Any thoughts?