Bonz said:
I wrote this song that has a Jaco P. type lead-in along with nothing but a 7/8 signature ride and hi-hat that last for 16 measures. Sounds very good until you hit measure 17 where all other instruments come in and there goes the bass .. lost in the sauce. So would a sub-mixer help with this?
A submix (either hardware or software)
could be used, but that is probably not the answer to what you described.
For small-combo jazz and fusion one of the most important aspects of getting the recording and getting the mix is the clarity and definition of each element and getting them to fit right in the both the sonic spectrum and in the rhythmic arrangement.
Without knowing just wat "all other instruments" are involved, what kind of bass sound you have going for you, what the musical arrangement actually sounds like etc. It's hard to prescribe an exact recipe, but making sure that the bass has it own space in the audio spectrum, in the stereo soundfield, and in time are the three perspectives from which to look at it.
AUDIO SPECTRUM
Other instruments that don't have major or imporant formants in the area of the spectrum dominated by the bass could possibly stand to have some or all of their bass frequencies notched or rolled off to "make room" for the bass. Alto sax, piano, higher-octave electric guitar, etc. are the kind of instrument that may have room to spare down there. Also, if you (just using the numbers as an example) say, add a little punch to the bass at 140Hz, an equivalent EQ notch of the kick at the same freq could help a lot.
SOUNDFIELD
Engineers tend to gravitate the low freq tracks like kick and bass towards the center for good reasons. But sometimes having too much sitting right at center pan can muddy them up a bit. If you have bass and drums and piano (or whatever) all at zero pan, spread them out a few degrees. At the low freqs especially, you won't hear the difference between 0 and -5 or +5 in the pan unless you are listening critically in headphones, and even then that difference can sound more organic than having a flagpole right at zero with every instrument haning off of it. But the main thing is that a bass at -5 and a kick at +5 will still sound centered but subliminally will have more room.
TIME
If there's a particular instrument or beat that's covering the bass like a drum or drums, slide the bass just a few milliseconds ahead the "competing" drum. This will not only seperate the two in time, but it will add emphasis to the bass via the Haas effect.
HTH,
G.