A few corrections. Midi has 128 notes per channel, usually named as C-2 through G8, for midi notes 0 through 127. The midi file coming into the BB does not have to be on channel 10, but everything needs to be one one channel.
In practice, it’s best to find a drumkit that appears to have the sounds you will want, i.e bass, organ, horns etc. Then open that drumkit in the BB Manager drum kit editor by double clicking on the kit’s name in the Drum Kit list in BB Manager. you can then scroll through the kit, and make notes of what is mapped where. Drums usually follow the General Midi standard (Google it); Bass is mapped at either 0 through 31, or 63 through 91, again, generally depending upon who built the kit; keyboards and other instruments are mapped beginning at 60, 72 or 84, depending on the kit, and depending on how much of the GM drum kit was needed.
What you do with a found midi file, is first edit it down to the components you need. You are likely not going to be able to use every part in a found file, because you are limited to 128 sounds on one channel, where a midi song has a drum kit of up to 45 or so sounds, and then full instrument ranges on 15 other channels. However you slice that up, its more than 128. The drums are usually good as is, but if the kit in the song uses drums above midi 60 (C3), you may run into conflicts with other sounds in your BB kit. If the sounds above midi 60 are not critical, cut them. Also, if the kick is at 35, copy and paste the kick notes to 36.
Next keep the bass. Let’s assume you use one of my kits where the bass is at 0 through 31. Look at the existing bass track. Where is the lowest note? Select all the notes in the bass track, and move the bass down, so that the lowest note is between midi 0 and 11. This will usually be a 3 octave drop. Now, are any notes in the bass above midi 31? Is so, select those, and lower those note by one octave. That should get all of your bass between 0 and 31. Check the range of the track to be sure.
Next, let’s assume you just want piano, bass and drums, and you have found one or more instruments that you think would make a good piano track. Merge the tracks that you are going use for your piano track into one track. You may want to do some cutting first to get rid of duplication, and to get rid of notes that are very high or very low. Next, select all the notes in your piano track, and move them up a couple octaves so that the lowest note is between midi 60 and 71. If you can’t move it up that high because the part gets past 127, you need to move high parts down, low parts up, or cut parts. It’s an art. You have to use your ears and your musical knowledge. Once you get that part in the 60 to 127 range (and for this purpose I am assuming you are using something like the Big Bose with Bass kit), you will then merge your bass, drums and piano tracks into one track. Save that track as a midi file, and then import it into BB as a song part, with the Big Bose kit assigned to the song. Then you can audition the song, and be ready to go back and do some editing.
There are other tutorials on this process posted in the Forum.
THANK YOU