I find for the best sounding mMaj7 chord I sometimes have to write a major + (augmented) chord a minor third higher than the root of the chord I want, and put the root after the slash. So for example CmMaj7 can be written Eb+/C and you will get the exact notes you want. Make sure the augmented is just a simple triad, with no embellished notes if the instruments likes to do that.
Try this sequence: Cm / Eb+/C / Cm7 / F7
It doesn't always work for all styles and instruments, but with regenerate you can usually get a satisfying result. I use this trick for other chords when I want to try a different voicing, putting the root I want after the slash and the upper notes as a simpler chord the appropriate interval above. So for example 1) CMaj7 > Em/C 2) Cm7 > Eb/C, C9 > Eh/C, Cb9 > Edim/C, etc. etc. Sometimes keeping the root out of the upper notes clarifies the harmony and you don't get awkward seconds or minor seconds where they don't sound good.
Last edited by ThomasS; 02/25/24 03:04 PM.